3x+(x-300)=2100

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Solution for 3x+(x-300)=2100 equation:


Simplifying
3x + (x + -300) = 2100

Reorder the terms:
3x + (-300 + x) = 2100

Remove parenthesis around (-300 + x)
3x + -300 + x = 2100

Reorder the terms:
-300 + 3x + x = 2100

Combine like terms: 3x + x = 4x
-300 + 4x = 2100

Solving
-300 + 4x = 2100

Solving for variable 'x'.

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

Add '300' to each side of the equation.
-300 + 300 + 4x = 2100 + 300

Combine like terms: -300 + 300 = 0
0 + 4x = 2100 + 300
4x = 2100 + 300

Combine like terms: 2100 + 300 = 2400
4x = 2400

Divide each side by '4'.
x = 600

Simplifying
x = 600

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