What is the answer to 6a+9-3a=a+3-4a ?

The answer to 6a+9-3a=a+3-4a is a=-1

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6a+9-3a=a+3-4a

6 a + 9 - 3 a = a + 3 - 4 a

a = - 1

Solution steps

6 a + 9 - 3 a = a + 3 - 4 a

Group like terms

6 a - 3 a + 9 = a + 3 - 4 a

Add similar elements:

6 a - 3 a = 3 a

3 a + 9 = a + 3 - 4 a

Group like terms

3 a + 9 = a - 4 a + 3

Add similar elements:

a - 4 a = - 3 a

3 a + 9 = - 3 a + 3

Move

9

to the right side

3 a = - 3 a - 6

Move

3 a

to the left side

6 a = - 6

Divide both sides by

6

a = - 1

8 (r + 1) = 8 r - 47

15 = 12 - 2 x

3 p - 8 = 13 - 4 p

(2 x + 1)^{2} = 4 (x^{2} - 1) + x - 1

n, r = n E - n r