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6(2x+5)=9
We move all terms to the left:
6(2x+5)-(9)=0
We multiply parentheses
12x+30-9=0
We add all the numbers together, and all the variables
12x+21=0
We move all terms containing x to the left, all other terms to the right
12x=-21
x=-21/12
x=-1+3/4
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