45=-3(a+8)+7(7+a)

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Solution for 45=-3(a+8)+7(7+a) equation:


Simplifying
45 = -3(a + 8) + 7(7 + a)

Reorder the terms:
45 = -3(8 + a) + 7(7 + a)
45 = (8 * -3 + a * -3) + 7(7 + a)
45 = (-24 + -3a) + 7(7 + a)
45 = -24 + -3a + (7 * 7 + a * 7)
45 = -24 + -3a + (49 + 7a)

Reorder the terms:
45 = -24 + 49 + -3a + 7a

Combine like terms: -24 + 49 = 25
45 = 25 + -3a + 7a

Combine like terms: -3a + 7a = 4a
45 = 25 + 4a

Solving
45 = 25 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
45 + -4a = 25 + 4a + -4a

Combine like terms: 4a + -4a = 0
45 + -4a = 25 + 0
45 + -4a = 25

Add '-45' to each side of the equation.
45 + -45 + -4a = 25 + -45

Combine like terms: 45 + -45 = 0
0 + -4a = 25 + -45
-4a = 25 + -45

Combine like terms: 25 + -45 = -20
-4a = -20

Divide each side by '-4'.
a = 5

Simplifying
a = 5

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