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(4/7)*x+6/7 = -2/7-(6/7) // + -2/7-(6/7)
(4/7)*x+6/7-(-2/7)+6/7 = 0
(4/7)*x+6/7+2/7+6/7 = 0
4/7*x+2 = 0 // - 2
4/7*x = -2 // : 4/7
x = -2/4/7
x = -7/2
x = -7/2
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