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5x+7(x+8.5)=245.5
We move all terms to the left:
5x+7(x+8.5)-(245.5)=0
We add all the numbers together, and all the variables
5x+7(x+8.5)-245.5=0
We multiply parentheses
5x+7x+59.5-245.5=0
We add all the numbers together, and all the variables
12x-186=0
We move all terms containing x to the left, all other terms to the right
12x=186
x=186/12
x=15+1/2
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