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(2/7)*x+4/7 = -3 // + 3
(2/7)*x+4/7+3 = 0
2/7*x+25/7 = 0 // - 25/7
2/7*x = -25/7 // : 2/7
x = -25/7/2/7
x = -25/2
x = -25/2
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