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x in (-oo:+oo)
(1/4)*x-(2/9) = 7/9 // - 7/9
(1/4)*x-(2/9)-(7/9) = 0
(1/4)*x-2/9-7/9 = 0
1/4*x-1 = 0 // + 1
1/4*x = 1 // : 1/4
x = 1/1/4
x = 4
x = 4
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