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x in (-oo:+oo)
(1/2)*(6*x-10)+x = 15 // - 15
(1/2)*(6*x-10)+x-15 = 0
1/2*(6*x-10)+x-15 = 0
1/2*(6*x-10)+x-15 = 0
4*x-15-5 = 0
4*x-20 = 0
4*x-20 = 0
4*x-20 = 0 // + 20
4*x = 20 // : 4
x = 20/4
x = 5
x = 5
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