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We can use the substitutive property and rearrange the exercise in a way that makes it easier for us to solve the exercise:
We solve the exercise from left to right:
Therefore, we obtain:
\( 94+12+6= \)
Rearranging helps you see like terms clearly! Grouping 2a-a together and 3-2 together makes it easier to combine without making mistakes.
When you see just 'a', it means 1a or one times a. So 2a-a = 2a-1a = 1a = a.
Yes! You can work left to right: becomes then . But rearranging often prevents errors!
Like terms have the exact same variable part. Here, 2a and -a are like terms (both have 'a'), while 3 and -2 are like terms (both are constants).
Double-check your arithmetic! The most common errors are: forgetting that a = 1a, or adding/subtracting constants incorrectly. Work step by step and verify your final answer.
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