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x in (-oo:+oo)
-7 = (-2/5)*x+4 // - (-2/5)*x+4
-((-2/5)*x)-7-4 = 0
(2/5)*x-7-4 = 0
2/5*x-11 = 0 // + 11
2/5*x = 11 // : 2/5
x = 11/2/5
x = 55/2
x = 55/2
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