7A-3A=15+A+3+3

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Solution for 7A-3A=15+A+3+3 equation: 


Simplifying
7A + -3A = 15 + A + 3 + 3

Combine like terms: 7A + -3A = 4A
4A = 15 + A + 3 + 3

Reorder the terms:
4A = 15 + 3 + 3 + A

Combine like terms: 15 + 3 = 18
4A = 18 + 3 + A

Combine like terms: 18 + 3 = 21
4A = 21 + A

Solving
4A = 21 + A

Solving for variable 'A'.

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

Add '-1A' to each side of the equation.
4A + -1A = 21 + A + -1A

Combine like terms: 4A + -1A = 3A
3A = 21 + A + -1A

Combine like terms: A + -1A = 0
3A = 21 + 0
3A = 21

Divide each side by '3'.
A = 7

Simplifying
A = 7

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