70-q-q-2q= 80
combine like terms first
so you get 70-4q= 80
subtract 70 on both sides and you get -4q= 10
divide -4 on both sides and you get q= 10/-4 or -2.5
The equation 70 − q − q − 2 q = 80 simplifies to find that q = − 2.5 . After substituting q back into the original equation, it confirms that the equation is true. Therefore, the equation holds with this value for q .
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