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4.3x-0.7(x+21)=8.61
We move all terms to the left:
4.3x-0.7(x+21)-(8.61)=0
We add all the numbers together, and all the variables
4.3x-0.7(x+21)-8.61=0
We multiply parentheses
4.3x-0.7x-14.7-8.61=0
We add all the numbers together, and all the variables
3.6x-23.31=0
We move all terms containing x to the left, all other terms to the right
3.6x=23.31
x=23.31/3.6
x=6+1/2.1052631578947
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