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x in (-oo:+oo)
16*x-(21*x) = 1/2 // - 1/2
16*x-(21*x)-(1/2) = 0
16*x-21*x-1/2 = 0
-5*x-1/2 = 0 // + 1/2
-5*x = 1/2 // : -5
x = 1/2/(-5)
x = -1/10
x = -1/10
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