300=3x-(100+2x)

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Solution for 300=3x-(100+2x) equation:


Simplifying
300 = 3x + -1(100 + 2x)
300 = 3x + (100 * -1 + 2x * -1)
300 = 3x + (-100 + -2x)

Reorder the terms:
300 = -100 + 3x + -2x

Combine like terms: 3x + -2x = 1x
300 = -100 + 1x

Solving
300 = -100 + 1x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
300 + -1x = -100 + 1x + -1x

Combine like terms: 1x + -1x = 0
300 + -1x = -100 + 0
300 + -1x = -100

Add '-300' to each side of the equation.
300 + -300 + -1x = -100 + -300

Combine like terms: 300 + -300 = 0
0 + -1x = -100 + -300
-1x = -100 + -300

Combine like terms: -100 + -300 = -400
-1x = -400

Divide each side by '-1'.
x = 400

Simplifying
x = 400

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