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x in (-oo:+oo)
(-5/4)*(x+8)+(1/4)*x = -8 // + 8
(-5/4)*(x+8)+(1/4)*x+8 = 0
x/4-5/4*(x+8)+8 = 0
(-5/4*4*(x+8))/4+x/4+(4*8)/4 = 0
x-5/4*4*(x+8)+4*8 = 0
32-4*x-40 = 0
-4*x-8 = 0
(-4*x-8)/4 = 0
(-4*x-8)/4 = 0 // * 4
-4*x-8 = 0
-4*x-8 = 0 // + 8
-4*x = 8 // : -4
x = 8/(-4)
x = -2
x = -2
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