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6x+2(x+5)=7

We move all terms to the left:

6x+2(x+5)-(7)=0

We multiply parentheses

6x+2x+10-7=0

We add all the numbers together, and all the variables

8x+3=0

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

8x=-3

x=-3/8

x=-3/8

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