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x in (-oo:+oo)
(1/3)*(y+2)+3*x = 7*x // - 7*x
(1/3)*(y+2)+3*x-(7*x) = 0
(1/3)*(y+2)+3*x-7*x = 0
1/3*(y+2)+3*x-7*x = 0
1/3*(y+2)+3*x-7*x = 0
3*x-7*x+1/3*y+2/3 = 0
1/3*y-4*x+2/3 = 0
1/3*y-4*x+2/3 = 0
1/3*y-4*x+2/3 = 0 // - 1/3*y+2/3
-4*x = -(1/3*y+2/3) // : -4
x = (-(1/3*y+2/3))/(-4)
x = (1/3*y+2/3)/4
x = (1/3*y+2/3)/4
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