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x in (-oo:+oo)
-77/5 = (18/5)*x+(1/4)*x // - (18/5)*x+(1/4)*x
-((18/5)*x)-((1/4)*x)-77/5 = 0
(-18/5)*x+(-1/4)*x-77/5 = 0
-77/20*x-77/5 = 0 // + 77/5
-77/20*x = 77/5 // : -77/20
x = 77/5/(-77/20)
x = -4
x = -4
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