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x in (-oo:+oo)
2*x = (-5/8)*x-18 // - (-5/8)*x-18
2*x-((-5/8)*x)+18 = 0
2*x+(5/8)*x+18 = 0
21/8*x+18 = 0 // - 18
21/8*x = -18 // : 21/8
x = -18/21/8
x = -48/7
x = -48/7
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