18=7-(a+10)

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Solution for 18=7-(a+10) equation:


Simplifying
18 = 7 + -1(a + 10)

Reorder the terms:
18 = 7 + -1(10 + a)
18 = 7 + (10 * -1 + a * -1)
18 = 7 + (-10 + -1a)

Combine like terms: 7 + -10 = -3
18 = -3 + -1a

Solving
18 = -3 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
18 + a = -3 + -1a + a

Combine like terms: -1a + a = 0
18 + a = -3 + 0
18 + a = -3

Add '-18' to each side of the equation.
18 + -18 + a = -3 + -18

Combine like terms: 18 + -18 = 0
0 + a = -3 + -18
a = -3 + -18

Combine like terms: -3 + -18 = -21
a = -21

Simplifying
a = -21

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