3x+x+2(3x)=840

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Solution for 3x+x+2(3x)=840 equation: 


Simplifying
3x + x + 2(3x) = 840

Remove parenthesis around (3x)
3x + x + 2 * 3x = 840

Multiply 2 * 3
3x + x + 6x = 840

Combine like terms: 3x + x = 4x
4x + 6x = 840

Combine like terms: 4x + 6x = 10x
10x = 840

Solving
10x = 840

Solving for variable 'x'.

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

Divide each side by '10'.
x = 84

Simplifying
x = 84

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