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x in (-oo:+oo)
(8/7)*(4*x+4)+(2/5)*x = (4/5)*(8*x+10) // - (4/5)*(8*x+10)
(8/7)*(4*x+4)-((4/5)*(8*x+10))+(2/5)*x = 0
(8/7)*(4*x+4)+(-4/5)*(8*x+10)+(2/5)*x = 0
8/7*(4*x+4)-4/5*(8*x+10)+(2*x)/5 = 0
(8/7*5*(4*x+4))/5+(-4/5*5*(8*x+10))/5+(2*x)/5 = 0
8/7*5*(4*x+4)-4/5*5*(8*x+10)+2*x = 0
2*x-64/7*x-120/7 = 0
-50/7*x-120/7 = 0
(-50/7*x-120/7)/5 = 0
(-50/7*x-120/7)/5 = 0 // * 5
-50/7*x-120/7 = 0
-50/7*x-120/7 = 0 // + 120/7
-50/7*x = 120/7 // : -50/7
x = 120/7/(-50/7)
x = -12/5
x = -12/5
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