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x in (-oo:+oo)
7-(x/3) = 4-x // - 4-x
x-(x/3)-4+7 = 0
2/3*x+3 = 0 // - 3
2/3*x = -3 // : 2/3
x = -3/2/3
x = -9/2
x = -9/2
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