x+4.2=2.1

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Solution for x+4.2=2.1 equation: 


Simplifying
x + 4.2 = 2.1

Reorder the terms:
4.2 + x = 2.1

Solving
4.2 + x = 2.1

Solving for variable 'x'.

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

Add '-4.2' to each side of the equation.
4.2 + -4.2 + x = 2.1 + -4.2

Combine like terms: 4.2 + -4.2 = 0.0
0.0 + x = 2.1 + -4.2
x = 2.1 + -4.2

Combine like terms: 2.1 + -4.2 = -2.1
x = -2.1

Simplifying
x = -2.1

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