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(2*a-3)/4-(3*a)+5*6 = 0
(2*a-3)/4-3*a+5*6 = 0
(2*a-3)/4-3*a+30 = 0
(2*a-3)/4+(-3*4*a)/4+(4*30)/4 = 0
2*a-3*4*a+4*30-3 = 0
120-10*a-3 = 0
117-10*a = 0
(117-10*a)/4 = 0
(117-10*a)/4 = 0 // * 4
117-10*a = 0
117-10*a = 0 // - 117
-10*a = -117 // : -10
a = -117/(-10)
a = 117/10
a = 117/10
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