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x in (-oo:+oo)
(-2*(1/3)*x)/3 = 7 // - 7
(-2*(1/3)*x)/3-7 = 0
-2/9*x-7 = 0 // + 7
-2/9*x = 7 // : -2/9
x = 7/(-2/9)
x = -63/2
x = -63/2
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