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x.4-12=200+12
We move all terms to the left:
x.4-12-(200+12)=0
We add all the numbers together, and all the variables
x.4-12-212=0
We add all the numbers together, and all the variables
x.4-224=0
We move all terms containing x to the left, all other terms to the right
x.4=224
x=224/1
x=224
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