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3-(x-7)=0
We simplify the equation to the form, which is simple to understand
3-(x-7)=0
Remove unnecessary parentheses
3-1x+7=0
We move all terms containing x to the left and all other terms to the right.
-1x=0-3-7
We simplify left and right side of the equation.
-1x=-10
We divide both sides of the equation by -1 to get x.
x=10
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