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x in (-oo:+oo)
(1/2)*(2*x-8) = (2/5)*(10*x-15)-1 // - (2/5)*(10*x-15)-1
(1/2)*(2*x-8)-((2/5)*(10*x-15))+1 = 0
(1/2)*(2*x-8)+(-2/5)*(10*x-15)+1 = 0
1/2*(2*x-8)-2/5*(10*x-15)+1 = 0
1/2*(2*x-8)-2/5*(10*x-15)+1 = 0
1-3*x+2 = 0
3-3*x = 0
3-3*x = 0
3-3*x = 0 // - 3
-3*x = -3 // : -3
x = -3/(-3)
x = 1
x = 1
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