− 3x − 30 = 5x + 18 −3x − 30 − 3x = 5x + 18 − 3x − 30 = 2x + 18 −30 − 18 = 2x + 18 −18 − 48= 2x Negative 48 over 2 equals 2x over 2 x=−24 Where is the error?

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MungeWrath · Answer 1 · 2019-02-18T14:50:56+0000

In the second and third line, where 3x was taken off both sides. On the left -3x-3x should have given -6x.
3x should have been added to both sides in order to cancel out the -3x

− 3x − 30 = 5x + 18 −3x − 30 − 3x = 5x + 18 − 3x − 30 = 2x + 18 −30 − 18 = 2x + 18 −18 − 48= 2x Negative 48 over 2 equals 2x over 2 x=−24 Where is the error?

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