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(3x+4)=13
We simplify the equation to the form, which is simple to understand
(3x+4)=13
Remove unnecessary parentheses
3x+4=13
We move all terms containing x to the left and all other terms to the right.
+3x=+13-4
We simplify left and right side of the equation.
+3x=+9
We divide both sides of the equation by 3 to get x.
x=3
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