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9(-21)-5(-21)-8=0
We simplify the equation to the form, which is simple to understand
9(-21)-5(-21)-8=0
Reorder the terms in parentheses
+(-189)-5*(-21)-8=0
Remove unnecessary parentheses
-189-5+*(-21+)-8=0
Reorder the terms in parentheses
-189+(+105)-8=0
Remove unnecessary parentheses
-189+105-8=0
We move all terms containing to the left and all other terms to the right.
0=0+189-105+8
We simplify left and right side of the equation.
0=+92
0=92
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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