10(3.1)=(8.7-0.8x)

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Solution for 10(3.1)=(8.7-0.8x) equation: 


Simplifying
10(3.1) = (8.7 + -0.8x)

Multiply 10 * 3.1
31 = (8.7 + -0.8x)

Remove parenthesis around (8.7 + -0.8x)
31 = 8.7 + -0.8x

Solving
31 = 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.
31 + 0.8x = 8.7 + -0.8x + 0.8x

Combine like terms: -0.8x + 0.8x = 0.0
31 + 0.8x = 8.7 + 0.0
31 + 0.8x = 8.7

Add '-31' to each side of the equation.
31 + -31 + 0.8x = 8.7 + -31

Combine like terms: 31 + -31 = 0
0 + 0.8x = 8.7 + -31
0.8x = 8.7 + -31

Combine like terms: 8.7 + -31 = -22.3
0.8x = -22.3

Divide each side by '0.8'.
x = -27.875

Simplifying
x = -27.875

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