-5.1x+7.2x=-8.4

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Solution for -5.1x+7.2x=-8.4 equation: 


Simplifying
-5.1x + 7.2x = -8.4

Combine like terms: -5.1x + 7.2x = 2.1x
2.1x = -8.4

Solving
2.1x = -8.4

Solving for variable 'x'.

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

Divide each side by '2.1'.
x = -4

Simplifying
x = -4

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