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7x+21x-8=7(4x+9)
We simplify the equation to the form, which is simple to understand
7x+21x-8=7(4x+9)
Reorder the terms in parentheses
7x+21x-8=+(+28x+63)
Remove unnecessary parentheses
+7x+21x-8=+28x+63
We move all terms containing x to the left and all other terms to the right.
+7x+21x-28x=+63+8
We simplify left and right side of the equation.
0x=+71
0=71
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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