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x in (-oo:+oo)
(-7/5)*x-(4*y) = 7 // - 7
(-7/5)*x-(4*y)-7 = 0
(-7/5)*x-4*y-7 = 0
-7/5*x-4*y-7 = 0 // + -4*y-7
-7/5*x = -(-4*y-7) // : -7/5
x = (-(-4*y-7))/(-7/5)
x = -5/7*(7-(-4*y))
x = -5/7*(7-(-4*y))
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