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(7/13)*x+7 = (3/13)*x-11 // - (3/13)*x-11
(7/13)*x-((3/13)*x)+7+11 = 0
(7/13)*x+(-3/13)*x+7+11 = 0
4/13*x+18 = 0 // - 18
4/13*x = -18 // : 4/13
x = -18/4/13
x = -117/2
x = -117/2
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