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a in (-oo:+oo)
3*((3/4)*a+3)+6 = 87 // - 87
3*((3/4)*a+3)-87+6 = 0
3*(3/4*a+3)-87+6 = 0
3*(3/4*a+3)-87+6 = 0
9/4*a-78+6 = 0
9/4*a-72 = 0
9/4*a-72 = 0
9/4*a-72 = 0 // + 72
9/4*a = 72 // : 9/4
a = 72/9/4
a = 32
a = 32
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