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