12-(7-x)=45

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Solution for 12-(7-x)=45 equation:


Simplifying
12 + -1(7 + -1x) = 45
12 + (7 * -1 + -1x * -1) = 45
12 + (-7 + 1x) = 45

Combine like terms: 12 + -7 = 5
5 + 1x = 45

Solving
5 + 1x = 45

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + 1x = 45 + -5

Combine like terms: 5 + -5 = 0
0 + 1x = 45 + -5
1x = 45 + -5

Combine like terms: 45 + -5 = 40
1x = 40

Divide each side by '1'.
x = 40

Simplifying
x = 40

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