(-5/7)c+1=21

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Solution for (-5/7)c+1=21 equation: 



(-5/7)c+1=21

We move all terms to the left:

(-5/7)c+1-(21)=0



Domain of the equation: 7)c!=0

c!=0/1

c!=0

c∈R



We add all the numbers together, and all the variables

(-5/7)c-20=0

We multiply parentheses

-5c^2-20=0

a = -5; b = 0; c = -20;
Δ = b2-4ac
Δ = 02-4·(-5)·(-20)
Δ = -400
Delta is less than zero, so there is no solution for the equation

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