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3(5)-42=-3(5+4)
We simplify the equation to the form, which is simple to understand
3(5)-42=-3(5+4)
Reorder the terms in parentheses
+(+15)-42=-3*(+9)
Remove unnecessary parentheses
+15-42=-3+*(+9+)
Reorder the terms in parentheses
+15-42=+(-27)
Remove unnecessary parentheses
+15-42=-27
We move all terms containing to the left and all other terms to the right.
0=-27-15+42
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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