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(3/7)*x+2 = (4/7)*x-5 // - (4/7)*x-5
(3/7)*x-((4/7)*x)+2+5 = 0
(3/7)*x+(-4/7)*x+2+5 = 0
7-1/7*x = 0 // - 7
-1/7*x = -7 // : -1/7
x = -7/(-1/7)
x = 49
x = 49
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