If it's not what You are looking for type in the equation solver your own equation and let us solve it.
t in (-oo:+oo)
7*(3*t+6) = 231 // - 231
7*(3*t+6)-231 = 0
7*(3*t+6)-231 = 0
21*t-189 = 0
21*t-189 = 0
21*t-189 = 0 // + 189
21*t = 189 // : 21
t = 189/21
t = 9
t = 9
| 3(4x+1)=147 | | 2*x-4=5*x+2 | | 6(1m+6)=36 | | 4(6x+10)=16 | | 6(10+a)=72 | | 6(8+3n)=48 | | 16-(6x-4)=6 | | w=5r/4+8k | | 4(4-6n)=-272 | | 7(5+5w)=280 | | 5(-4+3t)=160 | | 4(-5k-8)=-272 | | 6(7a+4)=276 | | 2(-3k-6)=24 | | 5(-1+1b)=20 | | 1/2(-12m+38) | | -6(x-1)=2(x-5) | | 6(1d+4)=-36 | | 6(2+4a)=-132 | | 2(5m+6)=42 | | 4(-4+7w)=96 | | 3(-3b+3)=9 | | -(x+1)=2(x-20) | | 4(2+5b)=128 | | 3(4+4x)=72 | | 3(1d+10)=42 | | 5(6-3a)=30 | | 5(5-3k)=40 | | 7(1x+9)=147 | | 3(8+b)=3 | | y=2x+11 | | 6(1a+10)=30 |