x+0.4(9-x)=6.3

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Solution for x+0.4(9-x)=6.3 equation:


Simplifying
x + 0.4(9 + -1x) = 6.3
x + (9 * 0.4 + -1x * 0.4) = 6.3
x + (3.6 + -0.4x) = 6.3

Reorder the terms:
3.6 + x + -0.4x = 6.3

Combine like terms: x + -0.4x = 0.6x
3.6 + 0.6x = 6.3

Solving
3.6 + 0.6x = 6.3

Solving for variable 'x'.

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

Add '-3.6' to each side of the equation.
3.6 + -3.6 + 0.6x = 6.3 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + 0.6x = 6.3 + -3.6
0.6x = 6.3 + -3.6

Combine like terms: 6.3 + -3.6 = 2.7
0.6x = 2.7

Divide each side by '0.6'.
x = 4.5

Simplifying
x = 4.5

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