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a in (-oo:+oo)
7*(6-(2*a)) = 5*((-3*a)/1) // - 5*((-3*a)/1)
7*(6-(2*a))-(5*((-3*a)/1)) = 0
7*(6-2*a)+15*a = 0
7*(6-2*a)+15*a = 0
a+42 = 0
a+42 = 0
a+42 = 0 // - 42
a = -42
a = -42
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