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2x*2-10x-72=0
We add all the numbers together, and all the variables
-10x+2x*2-72=0
Wy multiply elements
-10x+4x-72=0
We add all the numbers together, and all the variables
-6x-72=0
We move all terms containing x to the left, all other terms to the right
-6x=72
x=72/-6
x=-12
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