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x in (-oo:+oo)
-10 = (4/7)*x-12 // - (4/7)*x-12
12-((4/7)*x)-10 = 0
(-4/7)*x-10+12 = 0
2-4/7*x = 0 // - 2
-4/7*x = -2 // : -4/7
x = -2/(-4/7)
x = 7/2
x = 7/2
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