If it's not what You are looking for type in the equation solver your own equation and let us solve it.
84=2t
We move all terms to the left:
84-(2t)=0
We move all terms containing t to the left, all other terms to the right
-2t=-84
t=-84/-2
t=+42
| 162=-6(1-4v) | | 38=7x-4=6x-6 | | 6.2+v/5=-6.3 | | -10=w-14 | | 2x-x+3=5 | | 6.8=2z=2/10 | | 52=11x+2 | | 288=-8(-1-7x) | | 3x=$6.30 | | 8k^2-22=50 | | 23=29=11x+2 | | 6=-x+21 | | -104=8(7b-6) | | 0.6x+4.28=5.66 | | 6x+5−8x=9−6x | | –6c=–8c+4 | | (7r-5)+r=180 | | 15=z/8 | | 850=25x | | 1/3(1/2-9)=1/2(x+18) | | –9q=4−8q | | 4x-20+30=68 | | 2a+5=35-4a | | 2(5+2y)+6y=-4 | | 2x-4(x-1)=2 | | 27^x+4=81 | | 17=-x+21 | | –6y−7=–5y | | -8-5x=16+7x | | 45=2x+3x+5x | | 11=-x+21 | | –6k+9=–9k |