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3*x+(3/4)*x = -75/8 // + -75/8
3*x+(3/4)*x-(-75/8) = 0
3*x+(3/4)*x+75/8 = 0
15/4*x+75/8 = 0 // - 75/8
15/4*x = -75/8 // : 15/4
x = -75/8/15/4
x = -5/2
x = -5/2
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