If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-16+r=-20
We move all terms to the left:
-16+r-(-20)=0
We add all the numbers together, and all the variables
r+4=0
We move all terms containing r to the left, all other terms to the right
r=-4
| 10x-16=16x+8 | | 1/5(x-25)=4x+100 | | X-9=3x-13 | | u-6=1 | | 16x^2+7x-23=0 | | 34=6x-8 | | p/15=-20 | | x+651/3=1045/6 | | 3x+8=10+x | | 11x-2=33x-3 | | 8/9x+30=3/9x+45 | | 44–x+2x=50 | | 1/3h=6;h=3 | | 12x-16=4x+8 | | 2(n+3)=-46 | | 45=5/8x-15 | | (2x+55)=119 | | 13x-27=4x+81 | | 4(3^2x)+7=87 | | 12x-70=5x-14 | | 6y-5=2y+4 | | 24=9x-12 | | 5/7x+15=45 | | (x-3^2=1 | | 24x-36=12x+12 | | 8=h/16 | | 12=z-(-10) | | 6/12x+4=2/11x+16 | | 89=29+4b | | 5x-22=7x | | 4x+16=4x+32 | | 10x+36=16x+18 |