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(1/4)*(8*x+20) = 11 // - 11
(1/4)*(8*x+20)-11 = 0
1/4*(8*x+20)-11 = 0
1/4*(8*x+20)-11 = 0
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x = 3
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