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(1/4)*(4*x+7) = 8*x+16 // - 8*x+16
(1/4)*(4*x+7)-(8*x)-16 = 0
(1/4)*(4*x+7)-8*x-16 = 0
1/4*(4*x+7)-8*x-16 = 0
1/4*(4*x+7)-8*x-16 = 0
7/4-7*x-16 = 0
-7*x-57/4 = 0
-7*x-57/4 = 0
-7*x-57/4 = 0 // + 57/4
-7*x = 57/4 // : -7
x = 57/4/(-7)
x = -57/28
x = -57/28
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