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13-((3/7)*x) = 37 // - 37
13-((3/7)*x)-37 = 0
(-3/7)*x-37+13 = 0
-3/7*x-24 = 0 // + 24
-3/7*x = 24 // : -3/7
x = 24/(-3/7)
x = -56
x = -56
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