(x^2+90x+800)-(x^2+70x)=1800

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Solution for (x^2+90x+800)-(x^2+70x)=1800 equation:


Simplifying
(x2 + 90x + 800) + -1(x2 + 70x) = 1800

Reorder the terms:
(800 + 90x + x2) + -1(x2 + 70x) = 1800

Remove parenthesis around (800 + 90x + x2)
800 + 90x + x2 + -1(x2 + 70x) = 1800

Reorder the terms:
800 + 90x + x2 + -1(70x + x2) = 1800
800 + 90x + x2 + (70x * -1 + x2 * -1) = 1800
800 + 90x + x2 + (-70x + -1x2) = 1800

Reorder the terms:
800 + 90x + -70x + x2 + -1x2 = 1800

Combine like terms: 90x + -70x = 20x
800 + 20x + x2 + -1x2 = 1800

Combine like terms: x2 + -1x2 = 0
800 + 20x + 0 = 1800
800 + 20x = 1800

Solving
800 + 20x = 1800

Solving for variable 'x'.

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

Add '-800' to each side of the equation.
800 + -800 + 20x = 1800 + -800

Combine like terms: 800 + -800 = 0
0 + 20x = 1800 + -800
20x = 1800 + -800

Combine like terms: 1800 + -800 = 1000
20x = 1000

Divide each side by '20'.
x = 50

Simplifying
x = 50

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