If it's not what You are looking for type in the equation solver your own equation and let us solve it.
5+0.2c=21
We move all terms to the left:
5+0.2c-(21)=0
We add all the numbers together, and all the variables
0.2c-16=0
We move all terms containing c to the left, all other terms to the right
0.2c=16
c=16/0.2
c=80
| 2y,y=7 | | 21x-9=4 | | 0.3d-1.4=7.6 | | 15x-10-10=11x+15 | | 7e+4,e=3 | | 4h+17=-7 | | 3a,a=6 | | 3c+15=17+c | | 7.47=f+54.232 | | 40=8-5x | | ,4g+6=34 | | 4x+4+2x=3x+10 | | C(x)=40x+150 | | 7x+25=54 | | -35=x-12 | | 12x=12=3(4x-4) | | 2(6x-8)=9x+14 | | f(125)=3 | | 2(3x-4)=6-(2x+5) | | 4-2x(x+7)=3(x+5) | | –10–2(x–4)=3(x+6) | | 275.00=5500×÷x×4 | | 6x+3=→26 | | 7x+13=43–3x | | 275=5500×x/100×4 | | 2x+9)(x=3 | | -6k=5 | | 3(x+3)=7x+-11 | | -6x=-10x+24 | | 20x+7x=97 | | 4x2ª=196 | | 3(x-21)=-17 |