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(1/3)*(15*x+3)-((1/5)*(15*x-15)) = 0
(1/3)*(15*x+3)+(-1/5)*(15*x-15) = 0
1/3*(15*x+3)-1/5*(15*x-15) = 0
1/3*(15*x+3)-1/5*(15*x-15) = 0
2*x+4 = 0
2*x+4 = 0
2*x+4 = 0 // - 4
2*x = -4 // : 2
x = -4/2
x = -2
x = -2
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