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5.5(1.25+x)=12
We move all terms to the left:
5.5(1.25+x)-(12)=0
We add all the numbers together, and all the variables
5.5(x+1.25)-12=0
We multiply parentheses
5.5x+6.875-12=0
We add all the numbers together, and all the variables
5.5x-5.125=0
We move all terms containing x to the left, all other terms to the right
5.5x=5.125
x=5.125/5.5
x=1/1.07317073171
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