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3*x-15 = (-5/4)*x+5 // - (-5/4)*x+5
3*x-((-5/4)*x)-15-5 = 0
3*x+(5/4)*x-15-5 = 0
17/4*x-20 = 0 // + 20
17/4*x = 20 // : 17/4
x = 20/17/4
x = 80/17
x = 80/17
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