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10-4x =15-3x
10-15 =-3x+4x
-5 =x
2) -2x+5=-(x+9)
-2x+5=-x-9
5+9=-x+2x
14=x
3)18+7x=2(3x-4)
18+7x=6x-8
7x-6x=-8-18
x=-26