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a in (-oo:+oo)
3-3*a-(4*a) = -67 // + 67
3-3*a-(4*a)+67 = 0
3-3*a-4*a+67 = 0
70-7*a = 0 // - 70
-7*a = -70 // : -7
a = -70/(-7)
a = 10
a = 10
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