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x in (-oo:+oo)
X-((1/4)*(2*x+15)) = 3/4 // - 3/4
X-((1/4)*(2*x+15))-(3/4) = 0
(-1/4)*(2*x+15)+X-3/4 = 0
X-1/4*(2*x+15)-3/4 = 0
(-1/4*4*(2*x+15))/4+(4*X)/4-3/4 = 0
4*X-1/4*4*(2*x+15)-3 = 0
4*X-2*x-15-3 = 0
4*X-2*x-18 = 0
(4*X-2*x-18)/4 = 0
(4*X-2*x-18)/4 = 0 // * 4
4*X-2*x-18 = 0
4*X-2*x-18 = 0 // - 4*X-18
-2*x = -(4*X-18) // : -2
x = (-(4*X-18))/(-2)
x = (18-(4*X))/(-2)
x = (18-(4*X))/(-2)
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