If it's not what You are looking for type in the equation solver your own equation and let us solve it.
45-x=3x+21
We move all terms to the left:
45-x-(3x+21)=0
We add all the numbers together, and all the variables
-1x-(3x+21)+45=0
We get rid of parentheses
-1x-3x-21+45=0
We add all the numbers together, and all the variables
-4x+24=0
We move all terms containing x to the left, all other terms to the right
-4x=-24
x=-24/-4
x=+6
| 90-x=47+3x | | 54-3x=46-x | | 8+x=7+3x | | 5x-11/3=x-4 | | 7+f/3=8+f/4 | | 5(-2y+4)=3(3y-2)=6 | | 10.1.5=d+0.8 | | c/2+c/3=5 | | 3x+2x+x=62 | | (4y-20)=(9y-30) | | 6(x+4)+2(3x+8)=4 | | (2x+36)=(12x-66) | | (57-7z)=2(z-3) | | (15.8+2y)=(6y+7) | | (6v+6)=(3v+12) | | (4u+4)=(6u-12) | | (5x-15)=(6x-6) | | 4(8w+7)=7(w+4) | | (3w+-17)=(9w+13) | | 3w+-17=9w+13 | | 5x5=3x+11 | | 6v+6=3v+12 | | 100-2x=x-20 | | 4u+4=6u-12 | | 4(2z-1)=2-3(4z-5) | | 10(5g-15)=55 | | 6x+11=38 | | Y-x=2.75 | | 17=32-3f | | 3(d+3)=27 | | 18000000=Ix230x3600 | | 3(2v-7)=-9 |