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x in (-oo:+oo)
(1/9)*x-(2*y) = 57 // - 57
(1/9)*x-(2*y)-57 = 0
(1/9)*x-2*y-57 = 0
1/9*x-2*y-57 = 0 // + -2*y-57
1/9*x = -(-2*y-57) // : 1/9
x = (-(-2*y-57))/1/9
x = 9*(57-(-2*y))
x = 9*(57-(-2*y))
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