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(1/4)*(16*x+8)-18 = (-1/2)*(8*x-16) // - (-1/2)*(8*x-16)
(1/4)*(16*x+8)-((-1/2)*(8*x-16))-18 = 0
(1/4)*(16*x+8)+(1/2)*(8*x-16)-18 = 0
1/4*(16*x+8)+1/2*(8*x-16)-18 = 0
1/4*(16*x+8)+1/2*(8*x-16)-18 = 0
8*x-18-6 = 0
8*x-24 = 0
8*x-24 = 0
8*x-24 = 0 // + 24
8*x = 24 // : 8
x = 24/8
x = 3
x = 3
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