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x in (-oo:+oo)
(-1/4)*x+3 = (3/8)*x+4 // - (3/8)*x+4
(-1/4)*x-((3/8)*x)-4+3 = 0
(-1/4)*x+(-3/8)*x-4+3 = 0
-5/8*x-1 = 0 // + 1
-5/8*x = 1 // : -5/8
x = 1/(-5/8)
x = -8/5
x = -8/5
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