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3*x+15 = (2*x)/20 // - (2*x)/20
3*x-((2*x)/20)+15 = 0
3*x+(-1/10)*x+15 = 0
29/10*x+15 = 0 // - 15
29/10*x = -15 // : 29/10
x = -15/29/10
x = -150/29
x = -150/29
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