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x in (-oo:+oo)
(-2/5)*x-4 = -214/55 // + -214/55
(-2/5)*x-(-214/55)-4 = 0
(-2/5)*x+214/55-4 = 0
-2/5*x-6/55 = 0 // + 6/55
-2/5*x = 6/55 // : -2/5
x = 6/55/(-2/5)
x = -3/11
x = -3/11
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