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X*7-81=X*4-9
We move all terms to the left:
X*7-81-(X*4-9)=0
Wy multiply elements
7X-(X*4-9)-81=0
We get rid of parentheses
7X-X*4+9-81=0
We add all the numbers together, and all the variables
7X-X*4-72=0
Wy multiply elements
7X-4X-72=0
We add all the numbers together, and all the variables
3X-72=0
We move all terms containing X to the left, all other terms to the right
3X=72
X=72/3
X=24
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