4[a-(3a-5)]=a-7

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Solution for 4[a-(3a-5)]=a-7 equation:


Simplifying
4[a + -1(3a + -5)] = a + -7

Reorder the terms:
4[a + -1(-5 + 3a)] = a + -7
4[a + (-5 * -1 + 3a * -1)] = a + -7
4[a + (5 + -3a)] = a + -7

Reorder the terms:
4[5 + a + -3a] = a + -7

Combine like terms: a + -3a = -2a
4[5 + -2a] = a + -7
[5 * 4 + -2a * 4] = a + -7
[20 + -8a] = a + -7

Reorder the terms:
20 + -8a = -7 + a

Solving
20 + -8a = -7 + 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.
20 + -8a + -1a = -7 + a + -1a

Combine like terms: -8a + -1a = -9a
20 + -9a = -7 + a + -1a

Combine like terms: a + -1a = 0
20 + -9a = -7 + 0
20 + -9a = -7

Add '-20' to each side of the equation.
20 + -20 + -9a = -7 + -20

Combine like terms: 20 + -20 = 0
0 + -9a = -7 + -20
-9a = -7 + -20

Combine like terms: -7 + -20 = -27
-9a = -27

Divide each side by '-9'.
a = 3

Simplifying
a = 3

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