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x in (-oo:+oo)
-51/560 = (4/7)*x+(3/4)*x+9/10 // - (4/7)*x+(3/4)*x+9/10
-((4/7)*x)-((3/4)*x)-51/560-(9/10) = 0
(-4/7)*x+(-3/4)*x-51/560-9/10 = 0
-37/28*x-111/112 = 0 // + 111/112
-37/28*x = 111/112 // : -37/28
x = 111/112/(-37/28)
x = -3/4
x = -3/4
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