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4x-10+2x=14-21
We move all terms to the left:
4x-10+2x-(14-21)=0
We add all the numbers together, and all the variables
4x+2x-10-(-7)=0
We add all the numbers together, and all the variables
6x-3=0
We move all terms containing x to the left, all other terms to the right
6x=3
x=3/6
x=1/2
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