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11=7(1.57-3)+21
We simplify the equation to the form, which is simple to understand
11=7(1.57-3)+21
Reorder the terms in parentheses
11=+(-10.01)+21
Remove unnecessary parentheses
+11=-10.01+21
We move all terms containing to the left and all other terms to the right.
0=-10.01+21-11
We simplify left and right side of the equation.
0=-0.0099999999999998
0=-0.0099999999999998
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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