Equation #1:
18=7+(5-3)*2

Equation #2:
30=3+3*5

Equation #3:
Impossible

Equation #4:
Impossible

Equation #5:
2=(1)+(1)

Equation #6:
2=((1)+1)

Equation #7:
4=(1)+(1)+(1)+(1)

Equation #8:
4=(1)+(1)+(1)+(1)

Equation #9:
999=(90)+(900)+(9)

Equation #10:
1=12-1-1-1-1-1-1-1-1-1-1-1

Equation #11:
331776=2*3*4*2*3*4*2*3*4*2*3*4

Equation #12:
Impossible

Equation #13:
10=5+20-15

Equation #14:
Impossible

Equation #15:
18=7+(5-3)*2

Equation #16:
30=3+3*5

Equation #17:
Impossible

Equation #18:
30=(((3+3*5)))

Equation #19:
9=(2+(2+3))+2

Equation #20:
27=3*3*((3))

Equation #21:
999=900+90+9

Equation #22:
999=900+90+9

Equation #23:
999=(((((((((((((((((18*5)))))))))+((450)*(2))+(((((((((((((3))))))*3)))))))))))))))

Equation #24:
2=1+1

Equation #25:
Impossible

Equation #26:
5=(((((((((((((((((5)))))))))))))))))

Equation #27:
1=(1)

Equation #28:
123456789=((((((((((((((((((((((((((((((123456789))))))))))))))))))))))))))))))

Equation #29:
Impossible

Equation #30:
1=(2-1)

Equation #31:
Impossible

Equation #32:
Impossible

Equation #33:
Impossible

Equation #34:
5=(2+3)

Equation #35:
Impossible

Equation #36:
Impossible

Equation #37:
3=3

Equation #38:
Impossible

Equation #39:
19=100-200+119

Equation #40:
214=7*7*7*7-(3*3*3*3*3*(3*3))

Equation #41:
999=999+999-999

Equation #42:
100=1+2+3+4+5*6-7+8+9