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2x=0.0399(280+x)
We move all terms to the left:
2x-(0.0399(280+x))=0
We add all the numbers together, and all the variables
2x-(0.0399(x+280))=0
We calculate terms in parentheses: -(0.0399(x+280)), so:We get rid of parentheses
0.0399(x+280)
We multiply parentheses
0.0399x+11.172
Back to the equation:
-(0.0399x+11.172)
2x-0.0399x-11.172=0
We add all the numbers together, and all the variables
1.9601x-11.172=0
We move all terms containing x to the left, all other terms to the right
1.9601x=11.172
x=11.172/1.9601
x=5+1/1.4291651476486
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