Solve for x
x=21
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-9\times 4=-57+x
Multiply both sides by 4.
-36=-57+x
Multiply -9 and 4 to get -36.
-57+x=-36
Swap sides so that all variable terms are on the left hand side.
x=-36+57
Add 57 to both sides.
x=21
Add -36 and 57 to get 21.
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