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25=-6x-7x-1
We move all terms to the left:
25-(-6x-7x-1)=0
We add all the numbers together, and all the variables
-(-13x-1)+25=0
We get rid of parentheses
13x+1+25=0
We add all the numbers together, and all the variables
13x+26=0
We move all terms containing x to the left, all other terms to the right
13x=-26
x=-26/13
x=-2
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