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3(2x+7)=5x+21+x
We simplify the equation to the form, which is simple to understand
3(2x+7)=5x+21+x
Reorder the terms in parentheses
+(+6x+21)=5x+21+x
Remove unnecessary parentheses
+6x+21=+5x+21+x
We move all terms containing x to the left and all other terms to the right.
+6x-5x-1x=+21-21
We simplify left and right side of the equation.
0x=0
0=0
This equation is an identity, so all real numbers are solutions.
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