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(4/7)*x+11 = (5/7)*x-2 // - (5/7)*x-2
(4/7)*x-((5/7)*x)+2+11 = 0
(4/7)*x+(-5/7)*x+2+11 = 0
13-1/7*x = 0 // - 13
-1/7*x = -13 // : -1/7
x = -13/(-1/7)
x = 91
x = 91
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