If it's not what You are looking for type in the equation solver your own equation and let us solve it.
8-r=12
We move all terms to the left:
8-r-(12)=0
We add all the numbers together, and all the variables
-1r-4=0
We move all terms containing r to the left, all other terms to the right
-r=4
r=4/-1
r=-4
| 4+16x=0 | | 6(2x-1)/4=3 | | x^2+14=-14 | | 4x+3x+16x=0 | | 0.25x^2+1.5=1.25x | | 0.2x-12=0.8x+7 | | 2n^2-90n=0 | | (1/6)^x=279.936 | | (9+2x)/4=3x+2 | | (3)^x=177.147 | | 233=173-w | | 3a+45=4a+22 | | -x+146=219 | | 20-17x2=-14 | | x-0.15x=12750 | | 750-50h=200 | | 39+6m=123 | | 39+6m=99 | | 20-2h=8 | | 100+10w=450 | | 120=10(2)+b | | 5(x-3)+2=3(x-1)-4x | | 14+8s=134 | | 1/2(x+3)=1/4(4x-2) | | 30=8(2)+b | | 12=2(-2)+b | | 5(x-3)+2=3(x-1)4x | | x^2+0.01x-0.01=0 | | 6+4h=50 | | 60-4d=44 | | 4=1-2x | | 15(e+4)=12e |