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x in (-oo:+oo)
1 = (x+8)/4+x/2.5 // - (x+8)/4+x/2.5
1-((x+8)/4)-(x/2.5) = 0
1-((x+8)/4)-0.4*x = 0
(-1*(x+8))/4-0.4*x+1 = 0
(-1*(x+8))/4+(-0.4*4*x)/4+(1*4)/4 = 0
1*4-1*(x+8)-0.4*4*x = 0
4-2.6*x-8 = 0
-2.6*x-4 = 0
(-2.6*x-4)/4 = 0
(-2.6*x-4)/4 = 0 // * 4
-2.6*x-4 = 0
-2.6*x-4 = 0 // + 4
-2.6*x = 4 // : -2.6
x = 4/(-2.6)
x = -1.53846154
x = -1.53846154
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