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7(3x+5)-(21x-15)=0
We simplify the equation to the form, which is simple to understand
7(3x+5)-(21x-15)=0
Reorder the terms in parentheses
+(+21x+35)-(21x-15)=0
Remove unnecessary parentheses
+21x+35-(+21x-15+)=0
Remove unnecessary parentheses
+21x+35-21x+15=0
We move all terms containing x to the left and all other terms to the right.
+21x-21x=0-35-15
We simplify left and right side of the equation.
0x=-50
0=-50
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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