25=7+3a-12

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Solution for 25=7+3a-12 equation:


Simplifying
25 = 7 + 3a + -12

Reorder the terms:
25 = 7 + -12 + 3a

Combine like terms: 7 + -12 = -5
25 = -5 + 3a

Solving
25 = -5 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
25 + -3a = -5 + 3a + -3a

Combine like terms: 3a + -3a = 0
25 + -3a = -5 + 0
25 + -3a = -5

Add '-25' to each side of the equation.
25 + -25 + -3a = -5 + -25

Combine like terms: 25 + -25 = 0
0 + -3a = -5 + -25
-3a = -5 + -25

Combine like terms: -5 + -25 = -30
-3a = -30

Divide each side by '-3'.
a = 10

Simplifying
a = 10

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