3x+0.3(-7)=5.4

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Solution for 3x+0.3(-7)=5.4 equation: 


Simplifying
3x + 0.3(-7) = 5.4

Multiply 0.3 * -7
3x + -2.1 = 5.4

Reorder the terms:
-2.1 + 3x = 5.4

Solving
-2.1 + 3x = 5.4

Solving for variable 'x'.

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

Add '2.1' to each side of the equation.
-2.1 + 2.1 + 3x = 5.4 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + 3x = 5.4 + 2.1
3x = 5.4 + 2.1

Combine like terms: 5.4 + 2.1 = 7.5
3x = 7.5

Divide each side by '3'.
x = 2.5

Simplifying
x = 2.5

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