If it's not what You are looking for type in the equation solver your own equation and let us solve it.
21k+7=31
We move all terms to the left:
21k+7-(31)=0
We add all the numbers together, and all the variables
21k-24=0
We move all terms containing k to the left, all other terms to the right
21k=24
k=24/21
k=1+1/7
| -12x+x+x+1/2x=360 | | 4m-8(m+1/4)=-(m+3)+2m-3 | | h/7-3=2 | | 2(2x+1)=-14 | | 3c+-16c=13 | | 2x+25=37 | | 5z+8=-9+5z | | 16=12-g | | 10-6x=15+9x-3x | | -7+3x=-14 | | -11+5r=4(2+6r) | | 200x+11/2=548x-12/5 | | 48/16=x/8 | | 2x-(-8)=16 | | 30=4x+9 | | (x)=-14=10 | | 2b+3b-7=44 | | -8(-6+n)-5(1-2n)=49 | | 4x-30=110 | | 4(x)/5=84/15 | | w/2-5=-4 | | 3(4x+3)=12x-10 | | 2x+2+58+3x-5=180 | | 57=5w=17 | | 6x-13=11x+12 | | -40=c/6+-33 | | 63x-13=11x+12 | | -2.9(-7.8v-2)-3.6=-104.114 | | -2x+12=2x-45 | | 1.1x+1.2x5.4=–10 | | 5w+-3=4w-8 | | 15/x=5/10 |