If it's not what You are looking for type in the equation solver your own equation and let us solve it.
18=21x
We move all terms to the left:
18-(21x)=0
We move all terms containing x to the left, all other terms to the right
-21x=-18
x=-18/-21
x=6/7
| -36=12+6x | | 3y/4-5=25 | | 2x-4+3x=8+3x | | 4(2x-4)=7x-5 | | 6x/3+4=5 | | 2x-4+3x-7+x=5x+5 | | 5n-3/4=8 | | x+0.1x=375 | | (x+5)=(x-7)² | | 8x-(3x+5)=45 | | 2x+1,5-20=10+0,5x | | 2x+1½-20=10+½x | | X+0.12x=169 | | 8x/3+4=-4 | | n=2÷4 | | 6x/7+4=-2 | | 0,75x=100 | | 5n-3=8÷4 | | 10x-13=73 | | 4x-3=+2 | | x/3÷6=1 | | 7a+2a=8a-3 | | 4x+9=2x-1+ | | 7(u+3)=42 | | 7(u+5)=42 | | (1/2*x)+(x)+(x-5)=100 | | (1/2*x)+(x)+(x+5)=100 | | 1/2x+x+x+3=100 | | (1/2*x)+(x)+(x+3)=100 | | t^2-34t+120=0 | | 6-20=5x | | (1/2x)+x+(x+3)=100 |