If it's not what You are looking for type in the equation solver your own equation and let us solve it.
r+7-4r=13
We move all terms to the left:
r+7-4r-(13)=0
We add all the numbers together, and all the variables
-3r-6=0
We move all terms containing r to the left, all other terms to the right
-3r=6
r=6/-3
r=-2
| -1=a/2+2 | | -5×+7y=9 | | 8t+1=3t-9 | | 7x-12=68 | | -2x+50=6 | | 15t+8t-2t=6 | | 38x-3/4=-2x | | 50z=7 | | 6(y+3)=3030 | | N=4/5(m+7 | | |7x-1|=x+125 | | 7x=6x4 | | x3+6=8 | | 4(x+6)=2-6X+3) | | 9(x+1)(-x+2)=79 | | 6c-8-c=-16 | | P=e²/R | | -5÷-10+z=7 | | 2,7y=54 | | 5(x+2)-3x=1 | | 3x-11=22-3(x-1=9 | | -5{-10+z}=7 | | 7w=30+2w | | 0.4x=31 | | 73-2x=13 | | 3y=6-2(y-2) | | x²+11x+28=Y | | 42= 42+9b | | 8-(12/h)=14 | | 5n+5n+25=3n+18 | | (2x-3)+(8x)+(x+7)=180 | | 8-x=-3x+4 |