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15=18x+4.09(1-x)
We move all terms to the left:
15-(18x+4.09(1-x))=0
We add all the numbers together, and all the variables
-(18x+4.09(-1x+1))+15=0
We calculate terms in parentheses: -(18x+4.09(-1x+1)), so:We get rid of parentheses
18x+4.09(-1x+1)
We multiply parentheses
18x-4.09x+4.09
We add all the numbers together, and all the variables
13.91x+4.09
Back to the equation:
-(13.91x+4.09)
-13.91x-4.09+15=0
We add all the numbers together, and all the variables
-13.91x+10.91=0
We move all terms containing x to the left, all other terms to the right
-13.91x=-10.91
x=-10.91/-13.91
x=5.7120418848168/7.282722513089
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