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(1/4)*x+y = -2/7 // + -2/7
(1/4)*x+y-(-2/7) = 0
(1/4)*x+y+2/7 = 0
1/4*x+y+2/7 = 0 // - y+2/7
1/4*x = -(y+2/7) // : 1/4
x = (-(y+2/7))/1/4
x = -4*(y+2/7)
x = -4*(y+2/7)
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