0.7x+0.8(10-x)=7.5

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Solution for 0.7x+0.8(10-x)=7.5 equation:


Simplifying
0.7x + 0.8(10 + -1x) = 7.5
0.7x + (10 * 0.8 + -1x * 0.8) = 7.5
0.7x + (8 + -0.8x) = 7.5

Reorder the terms:
8 + 0.7x + -0.8x = 7.5

Combine like terms: 0.7x + -0.8x = -0.1x
8 + -0.1x = 7.5

Solving
8 + -0.1x = 7.5

Solving for variable 'x'.

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

Add '-8' to each side of the equation.
8 + -8 + -0.1x = 7.5 + -8

Combine like terms: 8 + -8 = 0
0 + -0.1x = 7.5 + -8
-0.1x = 7.5 + -8

Combine like terms: 7.5 + -8 = -0.5
-0.1x = -0.5

Divide each side by '-0.1'.
x = 5

Simplifying
x = 5

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