If it's not what You are looking for type in the equation solver your own equation and let us solve it.
57-9x=21
We move all terms to the left:
57-9x-(21)=0
We add all the numbers together, and all the variables
-9x+36=0
We move all terms containing x to the left, all other terms to the right
-9x=-36
x=-36/-9
x=+4
| 1/2(x+4)=3/8x+4 | | 25=21+z | | -2x(x-10)=40 | | 5x/3-x=3/15-12/5 | | 4(h+1/4)=3 | | 8(-2n-7)-2n=-146 | | 56+9h=82 | | 5+9t=3= | | 4n^2-100n-625=0 | | 3r-25=25 | | 8(-2n-7)2n=-146 | | -5/x+4=16 | | 8(x+7)=7(x–7) | | 7(a-4)=-84 | | 7/6x=40 | | 1/3y=48+y | | 38-y=17/8 | | -4=3y+8 | | 5x-19=-4x+4 | | 5x+10+x=50+4x+10 | | P(x)=x^2-40x+50 | | 6b^2+23b+6=-14 | | x+117=90 | | 6×y=54 | | n(n-5)(n+8)=0 | | 3/7=h/1-2/74 | | 2x^2-7x+180=0 | | X^2+2x-4=-@ | | |x-4|+9=14 | | 48=4*(x-1) | | 10-5q=3 | | x+x+x3+x3=26 |