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(1/8)*(7*x-7) = (x+7)/16 // - (x+7)/16
(1/8)*(7*x-7)-((x+7)/16) = 0
1/8*(7*x-7)+(-1*(x+7))/16 = 0
(1/8*16*(7*x-7))/16+(-1*(x+7))/16 = 0
1/8*16*(7*x-7)-1*(x+7) = 0
13*x-21 = 0
(13*x-21)/16 = 0
(13*x-21)/16 = 0 // * 16
13*x-21 = 0
13*x-21 = 0 // + 21
13*x = 21 // : 13
x = 21/13
x = 21/13
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