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1-x/21=3(x+9)/63
We simplify the equation to the form, which is simple to understand
1-x/21=3(x+9)/63
Reorder the terms in parentheses
1-0.047619047619048x=+(+3x+27)/63
Reorder the terms in parentheses
1-0.047619047619048x=+( + 0.047619047619048x + 0.42857142857143)
Remove unnecessary parentheses
+1-0.047619047619048x=0.047619047619048x + 0.42857142857143
We move all terms containing x to the left and all other terms to the right.
-0.047619047619048x-0.047619047619048x=0.42857142857143-1
We simplify left and right side of the equation.
-0.095238095238096x=-0.57142857142857
We divide both sides of the equation by -0.095238095238096 to get x.
x=6
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