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x in (-oo:+oo)
(-21.5*x)/5 = 3 // - 3
(-21.5*x)/5-3 = 0
-4.3*x-3 = 0 // + 3
-4.3*x = 3 // : -4.3
x = 3/(-4.3)
x = -0.69767442
x = -0.69767442
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