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x(10)+400-10x=400
We simplify the equation to the form, which is simple to understand
x(10)+400-10x=400
Reorder the terms in parentheses
+(+10x)+400-10x=400
Remove unnecessary parentheses
+10x+400-10x=+400
We move all terms containing x to the left and all other terms to the right.
+10x-10x=+400-400
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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