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x in (-oo:+oo)
3*y+21/2 = 7*x // - 7*x
3*y-(7*x)+21/2 = 0
3*y-7*x+21/2 = 0
3*y-7*x+21/2 = 0 // - 3*y+21/2
-7*x = -(3*y+21/2) // : -7
x = (-(3*y+21/2))/(-7)
x = (3*y+21/2)/7
x = (3*y+21/2)/7
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