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(1/2)*(4*x-8)+3*x+6 = 90 // - 90
(1/2)*(4*x-8)+3*x-90+6 = 0
1/2*(4*x-8)+3*x-90+6 = 0
1/2*(4*x-8)+3*x-90+6 = 0
5*x-90-4+6 = 0
5*x-94+6 = 0
5*x-88 = 0
5*x-88 = 0
5*x-88 = 0 // + 88
5*x = 88 // : 5
x = 88/5
x = 88/5
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