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8x-7(7x+3)=225
We move all terms to the left:
8x-7(7x+3)-(225)=0
We multiply parentheses
8x-49x-21-225=0
We add all the numbers together, and all the variables
-41x-246=0
We move all terms containing x to the left, all other terms to the right
-41x=246
x=246/-41
x=-6
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