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(4/37)*x+20/37 = 12/37 // - 12/37
(4/37)*x+20/37-(12/37) = 0
(4/37)*x+20/37-12/37 = 0
4/37*x+8/37 = 0 // - 8/37
4/37*x = -8/37 // : 4/37
x = -8/37/4/37
x = -2
x = -2
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