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(3/5)*(2*x+1) = 2*(1-(3*x))+13 // - 2*(1-(3*x))+13
(3/5)*(2*x+1)-(2*(1-(3*x)))-13 = 0
(3/5)*(2*x+1)-2*(1-3*x)-13 = 0
3/5*(2*x+1)-2*(1-3*x)-13 = 0
3/5*(2*x+1)-2*(1-3*x)-13 = 0
36/5*x-13-7/5 = 0
36/5*x-72/5 = 0
36/5*x-72/5 = 0
36/5*x-72/5 = 0 // + 72/5
36/5*x = 72/5 // : 36/5
x = 72/5/36/5
x = 2
x = 2
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