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(2/7)*x = -1/5 // + -1/5
(2/7)*x-(-1/5) = 0
(2/7)*x+1/5 = 0
2/7*x+1/5 = 0 // - 1/5
2/7*x = -1/5 // : 2/7
x = -1/5/2/7
x = -7/10
x = -7/10
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