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2(4x+5x)=72
We move all terms to the left:
2(4x+5x)-(72)=0
We add all the numbers together, and all the variables
2(+9x)-72=0
We multiply parentheses
18x-72=0
We move all terms containing x to the left, all other terms to the right
18x=72
x=72/18
x=4
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