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a in (-oo:+oo)
3*((33/4)*a+3)+6 = 87 // - 87
3*((33/4)*a+3)-87+6 = 0
3*(33/4*a+3)-87+6 = 0
3*(33/4*a+3)-87+6 = 0
99/4*a-78+6 = 0
99/4*a-72 = 0
99/4*a-72 = 0
99/4*a-72 = 0 // + 72
99/4*a = 72 // : 99/4
a = 72/99/4
a = 32/11
a = 32/11
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