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x in (-oo:+oo)
(-1/4)*x+6 = (-2/3)*x+28 // - (-2/3)*x+28
(-1/4)*x-((-2/3)*x)-28+6 = 0
(-1/4)*x+(2/3)*x-28+6 = 0
5/12*x-22 = 0 // + 22
5/12*x = 22 // : 5/12
x = 22/5/12
x = 264/5
x = 264/5
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