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x in (-oo:+oo)
X-((2/7)*x) = 30 // - 30
X-((2/7)*x)-30 = 0
X+(-2/7)*x-30 = 0
X-2/7*x-30 = 0 // - X-30
-2/7*x = -(X-30) // : -2/7
x = (-(X-30))/(-2/7)
x = -7/2*(30-X)
x = -7/2*(30-X)
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