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3*x-(15/4) = -15 // + 15
3*x-(15/4)+15 = 0
3*x-15/4+15 = 0
3*x+45/4 = 0 // - 45/4
3*x = -45/4 // : 3
x = -45/4/3
x = -15/4
x = -15/4
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