If it's not what You are looking for type in the equation solver your own equation and let us solve it.
6^(x-1)-5*6^(x-2)+4*3^(x+1)=3^(x+2)+15*3^(x-1)-21*6^(x-3)
We move all terms to the left:
6^(x-1)-5*6^(x-2)+4*3^(x+1)-(3^(x+2)+15*3^(x-1)-21*6^(x-3))=0
Wy multiply elements
6^(x-1)-30x(x+12x(x-(3^(x+2)+15*3^(x-1)-21*6^(x-3))=0
| (7/3x)-2/5=0 | | 3(t-4)+6=3(2t-4 | | 4x/17=49 | | u/5-17=4 | | 4x+7=25-8x | | 24x=2x(x) | | 90=16x-7 | | 0+2x=55 | | 2x-3=-1.5 | | 11x+3=90 | | x^2-2.5x+5625=0 | | 10-2x+13=17 | | -13x-34=19x-6 | | 16^-5x=4^4x+3 | | 20a+35×30=25.5 | | 0=-2x^2-8x-7 | | 8c-4=2c | | 2πr=15 | | 19+y=68 | | 8(2x-10+4=32 | | 4r^2-r-7=0 | | 9r+11=3r+12 | | -4x^2=8x-5 | | (x–7)^2–4=(x+1)^2 | | 0.13+0.09(y+4000)=1680 | | 2q-3=q+4 | | 3^6x−4=39 | | 10x-45=5x | | 7=t/24 | | k2=9/4 | | 4p-2=2p-5 | | w2=16/9 |