2.1c+1.8-.1c=7.8

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Solution for 2.1c+1.8-.1c=7.8 equation:


Simplifying
2.1c + 1.8 + -0.1c = 7.8

Reorder the terms:
1.8 + 2.1c + -0.1c = 7.8

Combine like terms: 2.1c + -0.1c = 2c
1.8 + 2c = 7.8

Solving
1.8 + 2c = 7.8

Solving for variable 'c'.

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

Add '-1.8' to each side of the equation.
1.8 + -1.8 + 2c = 7.8 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + 2c = 7.8 + -1.8
2c = 7.8 + -1.8

Combine like terms: 7.8 + -1.8 = 6
2c = 6

Divide each side by '2'.
c = 3

Simplifying
c = 3

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