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x in (-oo:+oo)
(1/3)*x = 10-(12/4) // - 10-(12/4)
(1/3)*x+12/4-10 = 0
1/3*x-7 = 0 // + 7
1/3*x = 7 // : 1/3
x = 7/1/3
x = 21
x = 21
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