4.2x+8.1x+1.8x-(2.1x)=

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Solution for 4.2x+8.1x+1.8x-(2.1x)= equation: 


Simplifying
4.2x + 8.1x + 1.8x + -1(2.1x) = 0

Remove parenthesis around (2.1x)
4.2x + 8.1x + 1.8x + -1 * 2.1x = 0

Multiply -1 * 2.1
4.2x + 8.1x + 1.8x + -2.1x = 0

Combine like terms: 4.2x + 8.1x = 12.3x
12.3x + 1.8x + -2.1x = 0

Combine like terms: 12.3x + 1.8x = 14.1x
14.1x + -2.1x = 0

Combine like terms: 14.1x + -2.1x = 12x
12x = 0

Solving
12x = 0

Solving for variable 'x'.

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

Divide each side by '12'.
x = 0

Simplifying
x = 0

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