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(3/4)*x-(2/7) = 4 // - 4
(3/4)*x-(2/7)-4 = 0
(3/4)*x-2/7-4 = 0
3/4*x-30/7 = 0 // + 30/7
3/4*x = 30/7 // : 3/4
x = 30/7/3/4
x = 40/7
x = 40/7
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