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x in (-oo:+oo)
(1/4)*x-7 = (1/9)*x // - (1/9)*x
(1/4)*x-((1/9)*x)-7 = 0
(1/4)*x+(-1/9)*x-7 = 0
5/36*x-7 = 0 // + 7
5/36*x = 7 // : 5/36
x = 7/5/36
x = 252/5
x = 252/5
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