10+(.8)c-1=30

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Solution for 10+(.8)c-1=30 equation: 


Simplifying
10 + (0.8) * c + -1 = 30

Reorder the terms:
10 + -1 + 0.8c = 30

Combine like terms: 10 + -1 = 9
9 + 0.8c = 30

Solving
9 + 0.8c = 30

Solving for variable 'c'.

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

Add '-9' to each side of the equation.
9 + -9 + 0.8c = 30 + -9

Combine like terms: 9 + -9 = 0
0 + 0.8c = 30 + -9
0.8c = 30 + -9

Combine like terms: 30 + -9 = 21
0.8c = 21

Divide each side by '0.8'.
c = 26.25

Simplifying
c = 26.25

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