If it's not what You are looking for type in the equation solver your own equation and let us solve it.
21=4t
We move all terms to the left:
21-(4t)=0
We move all terms containing t to the left, all other terms to the right
-4t=-21
t=-21/-4
t=5+1/4
| -5x+9=-4x+6 | | (x-1)(x+7)=(x=1)(x-3) | | −10.2+c=−8.14 | | p+3.7+0.6p+8.2=7.7+7.6p | | 2x-10/3=4x | | –3(x+4)–8x=21 | | 1,4x+6,1=7.9 | | 9(x-2)=x-6 | | -37-7p=-3(5p-6)-3p | | (p-9/3)=7 | | -12r-(-26)+(-1)=-13 | | 28=8x+3X-38 | | (5x-1)/(x+3)=1 | | 3+8n=-13+8n+6+7 | | 5(4x+5)=-21+6 | | 18x+27=18 | | (x+3)/4-(4x-5)/5=-1 | | 7+8x=10+11x | | 3x-15+3=8+7 | | 16x+36-38x=47 | | 13c+40=9c-10+c | | 47+3x+10=3x+10 | | 72−2x=11272−72−2x=112−72−2x÷−2=42÷−2x=−1 | | 22y-72=4y-180 | | -10+2t=10-8t | | -14=-3f+f-2 | | 2a+9=18 | | 10+7q=8+9q | | c/3-12=1 | | -5x+15=4x-3 | | -10x+10+-3x+4=−34 | | 3x-6+90+60+x=180 |