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(1/4)*(8*x+1) = 121/4 // - 121/4
(1/4)*(8*x+1)-(121/4) = 0
(1/4)*(8*x+1)-121/4 = 0
1/4*(8*x+1)-121/4 = 0
(1/4*4*(8*x+1))/4-121/4 = 0
1/4*4*(8*x+1)-121 = 0
8*x-120 = 0
(8*x-120)/4 = 0
(8*x-120)/4 = 0 // * 4
8*x-120 = 0
8*x-120 = 0 // + 120
8*x = 120 // : 8
x = 120/8
x = 15
x = 15
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