If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3x+40=4x+21
We move all terms to the left:
3x+40-(4x+21)=0
We get rid of parentheses
3x-4x-21+40=0
We add all the numbers together, and all the variables
-1x+19=0
We move all terms containing x to the left, all other terms to the right
-x=-19
x=-19/-1
x=+19
| 5a/2+3=7 | | (x-5)(x+8)=18 | | -10x+39=4x-17 | | 9=h+22/6 | | 0.2x+1.75=075x+0.25 | | 8x+38=-3(-6-5x) | | 5x+24=7x+34 | | (x+9)(x-9)=3(x-27 | | -9x+64=9x-80 | | 11(2X-6)-15=5(8-4x)+3x | | -7x-59=5x+49 | | 48+h+3h=100-2h | | 4x+27=8x+63 | | -8x-37=6x+33 | | x•18=72 | | 625-x.23=50 | | 5x+38=-7x-58 | | 2x+17=-9x-27 | | 7y/(3-6y)=12/5 | | 13) 3(x–2)=6 | | 9x+11=10x+12 | | -10x+28=x+6 | | 6(3s+2)=156 | | (2l+9)=50 | | 94•q=0 | | 4) 2w–8=26 | | x+39+32=180 | | 1) 10–2m=-2 | | 55+2=2+b | | x(x-10)=58 | | 70+m=70 | | 44+(60+100)=(n+)+60 |