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(-3/7)*x+2 = (-2/3)*x+116/63 // - (-2/3)*x+116/63
(-3/7)*x-((-2/3)*x)-(116/63)+2 = 0
(-3/7)*x+(2/3)*x-116/63+2 = 0
5/21*x+10/63 = 0 // - 10/63
5/21*x = -10/63 // : 5/21
x = -10/63/5/21
x = -2/3
x = -2/3
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