1) -(3.3x+1.2)-(0.7x+1.6)=0
-3.3x-1.2-0.7x-1.6=0
-4x=2.8
x=-0.7
2) -(4.1x+2.5)-(2.3+3.9)=1.6x
-4.1x-2.5-6.2-1.6x=0
-5.7x=8.7
x=87/57
3) (3.6x+2.5)-(1.8x+2.3)=1.6x
3.6x+2.5-1.8x-2.3-1.6x=0
0.2x=-0.2
x=-1
4) (1.3x-2.5x)-(3.8x-2.3)=3.7
-1.2x-3.8x=-2.3+3.7
-5x=1.4
x=-0.28
5) -(7.7x+2.2)-(5.5x-9.9x)=1.1
-7.7x+4.4x=2.2+1.1
-3.3x=3.3
x=-1