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7*x+(25^1)/2 = 3*x-15 // - 3*x-15
7*x-(3*x)+(25^1)/2+15 = 0
7*x-3*x+25/2+15 = 0
4*x+55/2 = 0 // - 55/2
4*x = -55/2 // : 4
x = -55/2/4
x = -55/8
x = -55/8
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