If it's not what You are looking for type in the equation solver your own equation and let us solve it.
20-u=13
We move all terms to the left:
20-u-(13)=0
We add all the numbers together, and all the variables
-1u+7=0
We move all terms containing u to the left, all other terms to the right
-u=-7
u=-7/-1
u=+7
| 3x3=80-2 | | -8(x-1)=-32 | | 40-7x=30 | | 25.62=8.2+4x | | x=1.50=500 | | 2(14x+2)=-5 | | -7(x-4)+2x=(x5) | | 16=2(2x+4)* | | 5(x-2)=16-1 | | 2(x+2)=(x-12) | | d/12-3=1 | | u+-13.8=-19.33 | | 2x+7=5x-11* | | 2m=8.6 | | 4(k-3)=2-(k-6) | | a-14=13a+16 | | 3(4x-2)=2(6x+4) | | 2u+36=-8(u+3) | | 24=n-12 | | 5x+7+8x-5=45 | | 7x-4+20x-1=180 | | 1/2x-3/4=1/x-1/4 | | 3(x+7)=4x-9 | | x+3=–x+9 | | -8(6x-2)=-272 | | 3x*0.6=x+240 | | x2+8x=66 | | x=29+6(10-7x) | | n/3−19=–17 | | g+14g+18=11g-18 | | 2/5+y=1/3 | | -14=3p+4. |