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(1/2)*x-7 = 3/4 // - 3/4
(1/2)*x-(3/4)-7 = 0
(1/2)*x-3/4-7 = 0
1/2*x-31/4 = 0 // + 31/4
1/2*x = 31/4 // : 1/2
x = 31/4/1/2
x = 31/2
x = 31/2
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