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x in (-oo:+oo)
X/4-42 = 9*x // - 9*x
X/4-(9*x)-42 = 0
X/4-9*x-42 = 0
1/4*X-9*x-42 = 0 // - 1/4*X-42
-9*x = -(1/4*X-42) // : -9
x = (-(1/4*X-42))/(-9)
x = (42-(1/4*X))/(-9)
x = (42-(1/4*X))/(-9)
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