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x in (-oo:+oo)
(2/3)*(5*x-(7*y)) = 4*x+y // - 4*x+y
(2/3)*(5*x-(7*y))-(4*x)-y = 0
(2/3)*(5*x-7*y)-4*x-y = 0
2/3*(5*x-7*y)-4*x-y = 0
2/3*(5*x-7*y)-4*x-y = 0
-2/3*x-14/3*y-y = 0
-2/3*x-17/3*y = 0
-2/3*x-17/3*y = 0
-2/3*x-17/3*y = 0 // + -17/3*y
-2/3*x = -(-17/3*y) // : -2/3
x = (-(-17/3*y))/(-2/3)
x = -17/2*y
x = -17/2*y
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