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10-5x=10-(4+3x-9)
10-5x=10-3x+5
-5x+3x=15-10
-2x=5
x=-2,5
b)
1-(5x+10-7)=-6x-18
1-5x-3+6x=-18
x=-18+2
x=-16
10-5x=10-[4+3x-9]
10-5x=10-4-3x+9
-5x+3x=-10+10-4+9
-2x=5/:(-2)
x=-5/2
x=-2i1/2
1-[5(x+2)-7]=6(-x-3)
1-[5x+10-7]=-6x-18
1-5x-10+7=-6x-18
-5x+6x=-1+10-7-18
x=-16