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X*2+X*5=7
We move all terms to the left:
X*2+X*5-(7)=0
Wy multiply elements
2X+5X-7=0
We add all the numbers together, and all the variables
7X-7=0
We move all terms containing X to the left, all other terms to the right
7X=7
X=7/7
X=1
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