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2x+12=3x-21
Use the distributive property to multiply 3 by x-7.
2x+12-3x=-21
Subtract 3x from both sides.
-x+12=-21
Combine 2x and -3x to get -x.
-x=-21-12
Subtract 12 from both sides.
-x=-33
Subtract 12 from -21 to get -33.
x=33
Multiply both sides by -1.