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x in (-oo:+oo)
77 = (2/3)*x+12 // - (2/3)*x+12
77-((2/3)*x)-12 = 0
(-2/3)*x-12+77 = 0
65-2/3*x = 0 // - 65
-2/3*x = -65 // : -2/3
x = -65/(-2/3)
x = 195/2
x = 195/2
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