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(1/8)*(x-4) = 2*x-(4*(4-x))-7 // - 2*x-(4*(4-x))-7
(1/8)*(x-4)+4*(4-x)-(2*x)+7 = 0
(1/8)*(x-4)+4*(4-x)-2*x+7 = 0
1/8*(x-4)+4*(4-x)-2*x+7 = 0
1/8*(x-4)+4*(4-x)-2*x+7 = 0
7-31/8*x-2*x+31/2 = 0
7-47/8*x+31/2 = 0
45/2-47/8*x = 0
45/2-47/8*x = 0
45/2-47/8*x = 0 // - 45/2
-47/8*x = -45/2 // : -47/8
x = -45/2/(-47/8)
x = 180/47
x = 180/47
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