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x in (-oo:+oo)
45 = (3/4)*x-13 // - (3/4)*x-13
13-((3/4)*x)+45 = 0
(-3/4)*x+13+45 = 0
58-3/4*x = 0 // - 58
-3/4*x = -58 // : -3/4
x = -58/(-3/4)
x = 232/3
x = 232/3
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