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x in (-oo:+oo)
(-1/4)*x-(0.7*x) = -4 // + 4
(-1/4)*x-(0.7*x)+4 = 0
(-1/4)*x-0.7*x+4 = 0
4-0.95*x = 0 // - 4
-0.95*x = -4 // : -0.95
x = -4/(-0.95)
x = 4.21052632
x = 4.21052632
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