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3(.75-x)=2.10
We move all terms to the left:
3(.75-x)-(2.10)=0
We add all the numbers together, and all the variables
3(-1x+0.75)-(2.1)=0
We add all the numbers together, and all the variables
3(-1x+0.75)-2.1=0
We multiply parentheses
-3x+2.25-2.1=0
We add all the numbers together, and all the variables
-3x+0.15=0
We move all terms containing x to the left, all other terms to the right
-3x=-0.15
x=-0.15/-3
x=0.15/3
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