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4*5*x+8 = (3*x)/8-13 // - (3*x)/8-13
4*5*x-((3*x)/8)+8+13 = 0
4*5*x+(-3/8)*x+8+13 = 0
157/8*x+21 = 0 // - 21
157/8*x = -21 // : 157/8
x = -21/157/8
x = -168/157
x = -168/157
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