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x in (-oo:+oo)
8*x+(2/7)*y = 3 // - 3
8*x+(2/7)*y-3 = 0
8*x+2/7*y-3 = 0 // - 2/7*y-3
8*x = -(2/7*y-3) // : 8
x = (-(2/7*y-3))/8
x = (3-(2/7*y))/8
x = (3-(2/7*y))/8
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