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a in (-oo:+oo)
(3/4)*(8*a-12)-5 = (4/5)*(5*a-20)-6 // - (4/5)*(5*a-20)-6
(3/4)*(8*a-12)-((4/5)*(5*a-20))-5+6 = 0
(3/4)*(8*a-12)+(-4/5)*(5*a-20)-5+6 = 0
3/4*(8*a-12)-4/5*(5*a-20)-5+6 = 0
3/4*(8*a-12)-4/5*(5*a-20)-5+6 = 0
2*a-5+6+7 = 0
2*a+2+6 = 0
2*a+8 = 0
2*a+8 = 0
2*a+8 = 0 // - 8
2*a = -8 // : 2
a = -8/2
a = -4
a = -4
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