30x+(31-x)*20=810

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Solution for 30x+(31-x)*20=810 equation:


Simplifying
30x + (31 + -1x) * 20 = 810

Reorder the terms for easier multiplication:
30x + 20(31 + -1x) = 810
30x + (31 * 20 + -1x * 20) = 810
30x + (620 + -20x) = 810

Reorder the terms:
620 + 30x + -20x = 810

Combine like terms: 30x + -20x = 10x
620 + 10x = 810

Solving
620 + 10x = 810

Solving for variable 'x'.

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

Add '-620' to each side of the equation.
620 + -620 + 10x = 810 + -620

Combine like terms: 620 + -620 = 0
0 + 10x = 810 + -620
10x = 810 + -620

Combine like terms: 810 + -620 = 190
10x = 190

Divide each side by '10'.
x = 19

Simplifying
x = 19

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