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(1/2)*(6*x-10) = 15 // - 15
(1/2)*(6*x-10)-15 = 0
1/2*(6*x-10)-15 = 0
1/2*(6*x-10)-15 = 0
3*x-20 = 0
3*x-20 = 0
3*x-20 = 0 // + 20
3*x = 20 // : 3
x = 20/3
x = 20/3
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