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a in (-oo:+oo)
3-(4*(2*a-8)) = (1/2)*(49*a+70) // - (1/2)*(49*a+70)
3-(4*(2*a-8))-((1/2)*(49*a+70)) = 0
(-1/2)*(49*a+70)-4*(2*a-8)+3 = 0
3-4*(2*a-8)-1/2*(49*a+70) = 0
3-4*(2*a-8)-1/2*(49*a+70) = 0
3-65/2*a-3 = 0
-65/2*a = 0
(-65*a)/2 = 0
(-65*a)/2 = 0 // * 2
-65*a = 0
-65*a = 0 // : -65
a = 0
a = 0
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