2a+3a=18-13

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Solution for 2a+3a=18-13 equation: 



2a+3a=18-13

We move all terms to the left:

2a+3a-(18-13)=0

We add all the numbers together, and all the variables

2a+3a-5=0

We add all the numbers together, and all the variables

5a-5=0

We move all terms containing a to the left, all other terms to the right

5a=5

a=5/5

a=1

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