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(1/4)*(8*x-20) = 7 // - 7
(1/4)*(8*x-20)-7 = 0
1/4*(8*x-20)-7 = 0
1/4*(8*x-20)-7 = 0
2*x-12 = 0
2*x-12 = 0
2*x-12 = 0 // + 12
2*x = 12 // : 2
x = 12/2
x = 6
x = 6
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