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4(x-3.1)=2.1(x-4)+3.5x
We move all terms to the left:
4(x-3.1)-(2.1(x-4)+3.5x)=0
We multiply parentheses
4x-(2.1(x-4)+3.5x)-12.4=0
We calculate terms in parentheses: -(2.1(x-4)+3.5x), so:We get rid of parentheses
2.1(x-4)+3.5x
We add all the numbers together, and all the variables
3.5x+2.1(x-4)
We multiply parentheses
3.5x+2.1x-8.4
We add all the numbers together, and all the variables
5.6x-8.4
Back to the equation:
-(5.6x-8.4)
4x-5.6x+8.4-12.4=0
We add all the numbers together, and all the variables
-1.6x-4=0
We move all terms containing x to the left, all other terms to the right
-1.6x=4
x=4/-1.6
x=-2+0.8/1.6
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