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(2/7)*x-2 = (1/4)*x-(47/28) // - (1/4)*x-(47/28)
(2/7)*x-((1/4)*x)+47/28-2 = 0
(2/7)*x+(-1/4)*x+47/28-2 = 0
1/28*x-9/28 = 0 // + 9/28
1/28*x = 9/28 // : 1/28
x = 9/28/1/28
x = 9
x = 9
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