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x in (-oo:+oo)
(7/12)*x = -4/36 // + -4/36
(7/12)*x-(-4/36) = 0
(7/12)*x+1/9 = 0
7/12*x+1/9 = 0 // - 1/9
7/12*x = -1/9 // : 7/12
x = -1/9/7/12
x = -4/21
x = -4/21
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