If it's not what You are looking for type in the equation solver your own equation and let us solve it.
21=5c+6
We move all terms to the left:
21-(5c+6)=0
We get rid of parentheses
-5c-6+21=0
We add all the numbers together, and all the variables
-5c+15=0
We move all terms containing c to the left, all other terms to the right
-5c=-15
c=-15/-5
c=+3
| -1+3n=n+3 | | 54=-7x+2x-16-10 | | 2x+5=2+4x+5 | | 2x-6/x+7=7 | | 12=4k+4 | | 6=s/4+3 | | 4(3x-3)=48 | | 8c-5c=7+11 | | -x2-3x-9=0 | | −12=3(5−r) | | 8x-6x+4=32 | | 15=3x+3=30 | | −29+5c=7c−27 | | 9x+11=0 | | P-5=-4p | | 11x-3x-5x-3x=5(x-2)3x | | 10x+5=9x+14 | | x2-15=-19 | | -3k=7+4kk= | | -10–9k=-7k | | 12x+7=0 | | 36b=3 | | 2b-8=0 | | 4{g-1}=24 | | x-1/2=-1/4 | | B^2+b=22 | | h/4+8=24 | | 3+2n=-3n+3 | | 24/7=3x-3 | | 6w–6=5w | | 34x+10=24x+6 | | 5f=-8+4f |