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(-2/7)*x+(26/21)*x = -5/21 // + -5/21
(-2/7)*x+(26/21)*x-(-5/21) = 0
(-2/7)*x+(26/21)*x+5/21 = 0
20/21*x+5/21 = 0 // - 5/21
20/21*x = -5/21 // : 20/21
x = -5/21/20/21
x = -1/4
x = -1/4
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