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x in (-oo:+oo)
2*(7-x) = 16/4 // - 16/4
2*(7-x)-(16/4) = 0
2*(7-x)-4 = 0
2*(7-x)-4 = 0
10-2*x = 0
10-2*x = 0
10-2*x = 0 // - 10
-2*x = -10 // : -2
x = -10/(-2)
x = 5
x = 5
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