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7(11+9)=7(11)+7(9)
We simplify the equation to the form, which is simple to understand
7(11+9)=7(11)+7(9)
Simplifying terms in parentheses
7*(+20)=7*(11)+7*(9)
Reorder the terms in parentheses
+(+140)=7*(11)+7*(9)
Remove unnecessary parentheses
+140=+7+*(+11+)+7+*(+9+)
Reorder the terms in parentheses
+140=+(+77)+7*(9)
Remove unnecessary parentheses
+140=+77+7+*(+9+)
Reorder the terms in parentheses
+140=+77+(+63)
Remove unnecessary parentheses
+140=+77+63
We move all terms containing to the left and all other terms to the right.
0=+77+63-140
We simplify left and right side of the equation.
0=0
0=0
This equation is an identity, so all real numbers are solutions.
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