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x in (-oo:+oo)
(1/3)*x-(7*y) = -50 // + 50
(1/3)*x-(7*y)+50 = 0
(1/3)*x-7*y+50 = 0
1/3*x-7*y+50 = 0 // - 50-7*y
1/3*x = -(50-7*y) // : 1/3
x = (-(50-7*y))/1/3
x = -3*(50-7*y)
x = -3*(50-7*y)
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