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4x+(x+5)=25

We move all terms to the left:

4x+(x+5)-(25)=0

We get rid of parentheses

4x+x+5-25=0

We add all the numbers together, and all the variables

5x-20=0

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

5x=20

x=20/5

x=4

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