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x in (-oo:+oo)
(8/7)*x-(10*y) = 4 // - 4
(8/7)*x-(10*y)-4 = 0
(8/7)*x-10*y-4 = 0
8/7*x-10*y-4 = 0 // + -10*y-4
8/7*x = -(-10*y-4) // : 8/7
x = (-(-10*y-4))/8/7
x = 7/8*(4-(-10*y))
x = 7/8*(4-(-10*y))
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