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625=49+b*2
We move all terms to the left:
625-(49+b*2)=0
We add all the numbers together, and all the variables
-(b*2+49)+625=0
We get rid of parentheses
-b*2-49+625=0
We add all the numbers together, and all the variables
-b*2+576=0
Wy multiply elements
-2b+576=0
We move all terms containing b to the left, all other terms to the right
-2b=-576
b=-576/-2
b=+288
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