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7(2x-5x)=-210
We move all terms to the left:
7(2x-5x)-(-210)=0
We add all the numbers together, and all the variables
7(-3x)-(-210)=0
We add all the numbers together, and all the variables
7(-3x)+210=0
We multiply parentheses
-21x+210=0
We move all terms containing x to the left, all other terms to the right
-21x=-210
x=-210/-21
x=+10
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