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x in (-oo:+oo)
(-7/6)*x = -4/12 // + -4/12
(-7/6)*x-(-4/12) = 0
(-7/6)*x+1/3 = 0
1/3-7/6*x = 0 // - 1/3
-7/6*x = -1/3 // : -7/6
x = -1/3/(-7/6)
x = 2/7
x = 2/7
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