7(5a-9)=100

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Solution for 7(5a-9)=100 equation: 



7(5a-9)=100

We move all terms to the left:

7(5a-9)-(100)=0

We multiply parentheses

35a-63-100=0

We add all the numbers together, and all the variables

35a-163=0

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

35a=163

a=163/35

a=4+23/35

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