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5x+15=\left(x-3\right)\times 7
Use the distributive property to multiply x+3 by 5.
5x+15=7x-21
Use the distributive property to multiply x-3 by 7.
5x+15-7x=-21
Subtract 7x from both sides.
-2x+15=-21
Combine 5x and -7x to get -2x.
-2x=-21-15
Subtract 15 from both sides.
-2x=-36
Subtract 15 from -21 to get -36.
x=\frac{-36}{-2}
Divide both sides by -2.
x=18
Divide -36 by -2 to get 18.