3a+15=45+7a

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Solution for 3a+15=45+7a equation:


Simplifying
3a + 15 = 45 + 7a

Reorder the terms:
15 + 3a = 45 + 7a

Solving
15 + 3a = 45 + 7a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-7a' to each side of the equation.
15 + 3a + -7a = 45 + 7a + -7a

Combine like terms: 3a + -7a = -4a
15 + -4a = 45 + 7a + -7a

Combine like terms: 7a + -7a = 0
15 + -4a = 45 + 0
15 + -4a = 45

Add '-15' to each side of the equation.
15 + -15 + -4a = 45 + -15

Combine like terms: 15 + -15 = 0
0 + -4a = 45 + -15
-4a = 45 + -15

Combine like terms: 45 + -15 = 30
-4a = 30

Divide each side by '-4'.
a = -7.5

Simplifying
a = -7.5

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