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(1/4)*(3*x+1) = 7 // - 7
(1/4)*(3*x+1)-7 = 0
1/4*(3*x+1)-7 = 0
1/4*(3*x+1)-7 = 0
3/4*x-27/4 = 0
3/4*x-27/4 = 0
3/4*x-27/4 = 0 // + 27/4
3/4*x = 27/4 // : 3/4
x = 27/4/3/4
x = 9
x = 9
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