2.80=.75(7+c)

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Solution for 2.80=.75(7+c) equation: 


Simplifying
2.80 = 0.75(7 + c)
2.80 = (7 * 0.75 + c * 0.75)
2.80 = (5.25 + 0.75c)

Solving
2.80 = 5.25 + 0.75c

Solving for variable 'c'.

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

Add '-0.75c' to each side of the equation.
2.80 + -0.75c = 5.25 + 0.75c + -0.75c

Combine like terms: 0.75c + -0.75c = 0.00
2.80 + -0.75c = 5.25 + 0.00
2.80 + -0.75c = 5.25

Add '-2.80' to each side of the equation.
2.80 + -2.80 + -0.75c = 5.25 + -2.80

Combine like terms: 2.80 + -2.80 = 0.00
0.00 + -0.75c = 5.25 + -2.80
-0.75c = 5.25 + -2.80

Combine like terms: 5.25 + -2.80 = 2.45
-0.75c = 2.45

Divide each side by '-0.75'.
c = -3.266666667

Simplifying
c = -3.266666667

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