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2x+30=50-12
We move all terms to the left:
2x+30-(50-12)=0
We add all the numbers together, and all the variables
2x+30-38=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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