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x in (-oo:+oo)
5*(x+2) = (3/5)*(10*x+5) // - (3/5)*(10*x+5)
5*(x+2)-((3/5)*(10*x+5)) = 0
5*(x+2)+(-3/5)*(10*x+5) = 0
5*(x+2)-3/5*(10*x+5) = 0
5*(x+2)-3/5*(10*x+5) = 0
7-x = 0
7-x = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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