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