3=.8(10-x)

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Solution for 3=.8(10-x) equation:


Simplifying
3 = 0.8(10 + -1x)
3 = (10 * 0.8 + -1x * 0.8)
3 = (8 + -0.8x)

Solving
3 = 8 + -0.8x

Solving for variable 'x'.

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

Add '0.8x' to each side of the equation.
3 + 0.8x = 8 + -0.8x + 0.8x

Combine like terms: -0.8x + 0.8x = 0.0
3 + 0.8x = 8 + 0.0
3 + 0.8x = 8

Add '-3' to each side of the equation.
3 + -3 + 0.8x = 8 + -3

Combine like terms: 3 + -3 = 0
0 + 0.8x = 8 + -3
0.8x = 8 + -3

Combine like terms: 8 + -3 = 5
0.8x = 5

Divide each side by '0.8'.
x = 6.25

Simplifying
x = 6.25

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