9.9=3x+4.2

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Solution for 9.9=3x+4.2 equation:


Simplifying
9.9 = 3x + 4.2

Reorder the terms:
9.9 = 4.2 + 3x

Solving
9.9 = 4.2 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
9.9 + -3x = 4.2 + 3x + -3x

Combine like terms: 3x + -3x = 0
9.9 + -3x = 4.2 + 0
9.9 + -3x = 4.2

Add '-9.9' to each side of the equation.
9.9 + -9.9 + -3x = 4.2 + -9.9

Combine like terms: 9.9 + -9.9 = 0.0
0.0 + -3x = 4.2 + -9.9
-3x = 4.2 + -9.9

Combine like terms: 4.2 + -9.9 = -5.7
-3x = -5.7

Divide each side by '-3'.
x = 1.9

Simplifying
x = 1.9

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