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(3/7)*x+11 = (5/7)*x-1 // - (5/7)*x-1
(3/7)*x-((5/7)*x)+1+11 = 0
(3/7)*x+(-5/7)*x+1+11 = 0
12-2/7*x = 0 // - 12
-2/7*x = -12 // : -2/7
x = -12/(-2/7)
x = 42
x = 42
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