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(4/7)*x+11 = (6/7)*x-9 // - (6/7)*x-9
(4/7)*x-((6/7)*x)+9+11 = 0
(4/7)*x+(-6/7)*x+9+11 = 0
20-2/7*x = 0 // - 20
-2/7*x = -20 // : -2/7
x = -20/(-2/7)
x = 70
x = 70
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