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8x-3x+7= 4x+4
5x-4x=4-7
x=-3
5- (x+5)/3 =2-x /*3
15-x-5=6-3x
-x+3x=6+5-15
2x=-4 / :2
x=-2
3x+(4-x)/5 =x-1/*5
15x+4-x=5x-5
15x-5x-x=-5-4
9x=-9 / :9
x=-1
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