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a in (-oo:+oo)
-(6*a)-4 = -3*a-37 // + -3*a-37
37-(6*a)-(-3*a)-4 = 0
3*a-6*a-4+37 = 0
33-3*a = 0 // - 33
-3*a = -33 // : -3
a = -33/(-3)
a = 11
a = 11
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