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Q: 3a plus 21 equals 30 what is a?

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a = 20

depends what 'a' =

If a + b = 6, what is the value of 3a + 3b?

3a - 7 = -28 Therefore, 3a = -21 a = -21/3 Therefore, a = -7

a + a + a - 2a = 3a - 2a = a

Related questions

a = 20

9a+21 3(3a+7)

depends what 'a' =

3a = 21 Therefore, a = 21/3 a = 7

If a + b = 6, what is the value of 3a + 3b?

3a - 7 = -28 Therefore, 3a = -21 a = -21/3 Therefore, a = -7

a + 3a + 5a = 180 9a =180 a = 20

2a + 3a + 4 = 5a + 4

1

a + a + a - 2a = 3a - 2a = a

-21 = 9a - 15 - 3a -6 = 6a -1 = a

3a plus 4 equals 3a +4. You can not combine the two parts because they are not like terms so there is no way to simplify this.