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2 = (3/7)*x-13 // - (3/7)*x-13
2-((3/7)*x)+13 = 0
(-3/7)*x+2+13 = 0
15-3/7*x = 0 // - 15
-3/7*x = -15 // : -3/7
x = -15/(-3/7)
x = 35
x = 35
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