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(2/5)*(5*x-10)+(1/3)*(12*x+3) = 0
2/5*(5*x-10)+1/3*(12*x+3) = 0
2/5*(5*x-10)+1/3*(12*x+3) = 0
6*x-3 = 0
6*x-3 = 0
6*x-3 = 0 // + 3
6*x = 3 // : 6
x = 3/6
x = 1/2
x = 1/2
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