If it's not what You are looking for type in the equation solver your own equation and let us solve it.
42=8-8-(t-20
We move all terms to the left:
42-(8-8-(t-20)=0
| -2d-15d+16d=-15 | | 3*m-5=2*m | | 9–6f=-5f | | 9a-45+2a-2=19 | | 9x-4/5=8x+2/10 | | 12r-18=12r+18 | | 4(y+2)=12 | | 3z–8=5z+10 | | 21x-3=3x+16 | | 9+6x=-4 | | 7-8p=-15/4 | | 2e=4e-14 | | -9b–2=-3b+10 | | 3x-2=7x-30 | | 170+0.25x=310 | | 7x+3x-12x=3x+1 | | -3.36-11.2d=-19.6d | | 1/5x+1/3x-1/2x=2 | | -7–8k–1=-10k+8 | | 18g=-19+17g | | 3h=9+4h | | 9(2x+8)=270 | | 12z+19=-20z+19 | | 3.5x−3.5x=9 | | x8=4 | | 1x/20=1/5 | | 25/x=20 | | 10m-1=4m+17 | | 17f+11+11=10+16f | | |9+6x|=4 | | -6x-29=6x-7 | | 2g=-9+g |