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x in (-oo:+oo)
(1/4)*x+0.8 = -1.3 // + 1.3
(1/4)*x+0.8+1.3 = 0
1/4*x+2.1 = 0 // - 2.1
1/4*x = -2.1 // : 1/4
x = -2.1/1/4
x = -8.4
x = -8.4
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