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x*2+7x+15=0
We add all the numbers together, and all the variables
7x+x*2+15=0
Wy multiply elements
7x+2x+15=0
We add all the numbers together, and all the variables
9x+15=0
We move all terms containing x to the left, all other terms to the right
9x=-15
x=-15/9
x=-1+2/3
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