81=105-(5+x+7.5)

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Solution for 81=105-(5+x+7.5) equation:


Simplifying
81 = 105 + -1(5 + x + 7.5)

Reorder the terms:
81 = 105 + -1(5 + 7.5 + x)

Combine like terms: 5 + 7.5 = 12.5
81 = 105 + -1(12.5 + x)
81 = 105 + (12.5 * -1 + x * -1)
81 = 105 + (-12.5 + -1x)

Combine like terms: 105 + -12.5 = 92.5
81 = 92.5 + -1x

Solving
81 = 92.5 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
81 + x = 92.5 + -1x + x

Combine like terms: -1x + x = 0
81 + x = 92.5 + 0
81 + x = 92.5

Add '-81' to each side of the equation.
81 + -81 + x = 92.5 + -81

Combine like terms: 81 + -81 = 0
0 + x = 92.5 + -81
x = 92.5 + -81

Combine like terms: 92.5 + -81 = 11.5
x = 11.5

Simplifying
x = 11.5

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