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(1/4)*x-((1/7)*x) = 3 // - 3
(1/4)*x-((1/7)*x)-3 = 0
(1/4)*x+(-1/7)*x-3 = 0
3/28*x-3 = 0 // + 3
3/28*x = 3 // : 3/28
x = 3/3/28
x = 28
x = 28
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