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(2/3)*(5*x+7) = (1/5)*x-3 // - (1/5)*x-3
(2/3)*(5*x+7)-((1/5)*x)+3 = 0
(2/3)*(5*x+7)+(-1/5)*x+3 = 0
2/3*(5*x+7)-x/5+3 = 0
(2/3*5*(5*x+7))/5-x/5+(3*5)/5 = 0
2/3*5*(5*x+7)-x+3*5 = 0
47/3*x+15+70/3 = 0
47/3*x+115/3 = 0
(47/3*x+115/3)/5 = 0
(47/3*x+115/3)/5 = 0 // * 5
47/3*x+115/3 = 0
47/3*x+115/3 = 0 // - 115/3
47/3*x = -115/3 // : 47/3
x = -115/3/47/3
x = -115/47
x = -115/47
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