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-2(18-3)=7x^2x
We move all terms to the left:
-2(18-3)-(7x^2x)=0
We add all the numbers together, and all the variables
-7x^2x-215=0
We move all terms containing x to the left, all other terms to the right
-7x^2x=215
x=215/1
x=215
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