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x in (-oo:+oo)
X/5-4 = x/7-2 // - x/7-2
X/5-(x/7)-4+2 = 0
1/5*X-1/7*x-2 = 0 // - 1/5*X-2
-1/7*x = -(1/5*X-2) // : -1/7
x = (-(1/5*X-2))/(-1/7)
x = -7*(2-(1/5*X))
x = -7*(2-(1/5*X))
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