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3+x+x=145
We simplify the equation to the form, which is simple to understand
3+x+x=145
We move all terms containing x to the left and all other terms to the right.
+1x+1x=+145-3
We simplify left and right side of the equation.
+2x=+142
We divide both sides of the equation by 2 to get x.
x=71
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