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2.1x+-1(1+4.2x)=5.3
We move all terms to the left:
2.1x+-1(1+4.2x)-(5.3)=0
We add all the numbers together, and all the variables
2.1x-1(4.2x+1)+-(5.3)=0
We add all the numbers together, and all the variables
2.1x-1(4.2x+1)-5.3=0
We move all terms containing x to the left, all other terms to the right
2.1x-1(4.2x+1)=5.3
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