If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
7*(6*a+9) = 357 // - 357
7*(6*a+9)-357 = 0
7*(6*a+9)-357 = 0
42*a-294 = 0
42*a-294 = 0
42*a-294 = 0 // + 294
42*a = 294 // : 42
a = 294/42
a = 7
a = 7
| 6(-3x+2)=-78 | | 2(9+5w)=138 | | 2(2-5b)=104 | | 3(5b+1)=18 | | 6(-1m+5)=-36 | | 4(4+2t)=80 | | 2(-1x-7)=-28 | | (5x+3)-(4x-9)=0 | | 7(2-5t)=14 | | 6(4+3m)=150 | | 6(-5-3m)=42 | | 6(2+k)=66 | | 6(3t+5)=246 | | 3(2a-9)=3 | | 2(-6m+9)=126 | | 2(5k+7)=74 | | 6(9-2n)=30 | | 2(-8-5t)=-46 | | 2(5+6k)=118 | | 5(5+2m)=105 | | 7(6k+8)=14 | | 2(4k+5)=58 | | 7(-4x+3)=329 | | 6(-5m-3)=-318 | | 5(-8+4x)=0 | | 3(5-6d)=-129 | | 4(1x-2)=40 | | 2(5d+9)=18 | | 4(-4m+6)=-40 | | 3(6d+4)=-24 | | 2x-3(5-x)=35 | | 7(6d+5)=-343 |