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(2*a-3)/4+5*6-3 = 0
(2*a-3)/4-3+30 = 0
(2*a-3)/4+(4*30)/4+(-3*4)/4 = 0
2*a+4*30-3*4-3 = 0
2*a-12+117 = 0
2*a+105 = 0
(2*a+105)/4 = 0
(2*a+105)/4 = 0 // * 4
2*a+105 = 0
2*a+105 = 0 // - 105
2*a = -105 // : 2
a = -105/2
a = -105/2
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