4(a+7)=9[a-(a-5)]

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Solution for 4(a+7)=9[a-(a-5)] equation:


Simplifying
4(a + 7) = 9[a + -1(a + -5)]

Reorder the terms:
4(7 + a) = 9[a + -1(a + -5)]
(7 * 4 + a * 4) = 9[a + -1(a + -5)]
(28 + 4a) = 9[a + -1(a + -5)]

Reorder the terms:
28 + 4a = 9[a + -1(-5 + a)]
28 + 4a = 9[a + (-5 * -1 + a * -1)]
28 + 4a = 9[a + (5 + -1a)]

Reorder the terms:
28 + 4a = 9[5 + a + -1a]

Combine like terms: a + -1a = 0
28 + 4a = 9[5 + 0]
28 + 4a = 9[5]

Multiply 9 * 5
28 + 4a = 45

Solving
28 + 4a = 45

Solving for variable 'a'.

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

Add '-28' to each side of the equation.
28 + -28 + 4a = 45 + -28

Combine like terms: 28 + -28 = 0
0 + 4a = 45 + -28
4a = 45 + -28

Combine like terms: 45 + -28 = 17
4a = 17

Divide each side by '4'.
a = 4.25

Simplifying
a = 4.25

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