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x in (-oo:+oo)
4*(8-7*x) = 4 // - 4
4*(8-7*x)-4 = 0
4*(8-7*x)-4 = 0
28-28*x = 0
28-28*x = 0
28-28*x = 0 // - 28
-28*x = -28 // : -28
x = -28/(-28)
x = 1
x = 1
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