If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-2.3+4.2x=-66.3
We move all terms to the left:
-2.3+4.2x-(-66.3)=0
We add all the numbers together, and all the variables
4.2x+64=0
We move all terms containing x to the left, all other terms to the right
4.2x=-64
x=-64/4.2
x=-15+1/4.2
| x-7=-8x+13x= | | 9x-21=-9 | | x+10=58+5x | | 3x=-6.3 | | 9x+21=-9 | | (9x-26)+(2x-12)+(4x+43)=180 | | -21x+3=-18 | | -9+4x=-7x-31 | | 3j+4j+3j-9j+1=15 | | 6x-8+6x=64 | | .4x+3-9x=8 | | x-7=-8x+13,x= | | 2(x-7)+6=1x-5 | | 3+2.8=h | | -2.3x+4.2x=-66.3 | | 7+m-10=2m | | 15d+(-5d)+(-2d)-(-16)=-16 | | 6(12=6x) | | s-44=41 | | 2q+32=8/1 | | s−44=41 | | 9+6x=-7x+35 | | 2(u-2)-7=-7(-3u+1)-9u | | (2x-13)+11=180 | | 2x-2=7x+38 | | -9n=99 | | 3x-24=-54 | | -8=3x+4x+6 | | 6h-20h+(-5h)=19 | | -16x^2+22x+5=0 | | -x-6=6x-76 | | 7(x-4)+9=7x+19 |