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Given that in the exercise there is only one addition operation, the substitution property can be used:
We solve the exercise from left to right:
Now we obtain:
\( 94+12+6= \)
The coefficient 2 is attached to the variable a, so means "2 times a". You can only combine like terms - constants with constants, variables with the same variables.
They are exactly the same due to the commutative property! However, it's common practice to write variables first, so is the preferred form.
Like terms have the same variable part. Constants (plain numbers) go together, terms with a go together, terms with x go together, etc.
No, this is simplifying an expression! There's no equals sign with a value to solve for. We're just combining like terms to write it in simplest form.
Then you could combine them! because they're like terms. But and constants like 5 and 4 cannot be combined.
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