90-(2x+9)=20

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Solution for 90-(2x+9)=20 equation:


Simplifying
90 + -1(2x + 9) = 20

Reorder the terms:
90 + -1(9 + 2x) = 20
90 + (9 * -1 + 2x * -1) = 20
90 + (-9 + -2x) = 20

Combine like terms: 90 + -9 = 81
81 + -2x = 20

Solving
81 + -2x = 20

Solving for variable 'x'.

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

Add '-81' to each side of the equation.
81 + -81 + -2x = 20 + -81

Combine like terms: 81 + -81 = 0
0 + -2x = 20 + -81
-2x = 20 + -81

Combine like terms: 20 + -81 = -61
-2x = -61

Divide each side by '-2'.
x = 30.5

Simplifying
x = 30.5

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