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x in (-oo:+oo)
(-4/7)*x = 21.8 // - 21.8
(-4/7)*x-21.8 = 0
-4/7*x-21.8 = 0 // + 21.8
-4/7*x = 21.8 // : -4/7
x = 21.8/(-4/7)
x = -38.1500001
x = -38.1500001
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