3.1=8.7-0.8x

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Solution for 3.1=8.7-0.8x equation: 


Simplifying
3.1 = 8.7 + -0.8x

Solving
3.1 = 8.7 + -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.
3.1 + 0.8x = 8.7 + -0.8x + 0.8x

Combine like terms: -0.8x + 0.8x = 0.0
3.1 + 0.8x = 8.7 + 0.0
3.1 + 0.8x = 8.7

Add '-3.1' to each side of the equation.
3.1 + -3.1 + 0.8x = 8.7 + -3.1

Combine like terms: 3.1 + -3.1 = 0.0
0.0 + 0.8x = 8.7 + -3.1
0.8x = 8.7 + -3.1

Combine like terms: 8.7 + -3.1 = 5.6
0.8x = 5.6

Divide each side by '0.8'.
x = 7

Simplifying
x = 7

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