If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
f/7 = 8 // - 8
f/7-8 = 0
1/7*f-8 = 0 // + 8
1/7*f = 8 // : 1/7
f = 8/1/7
f = 56
f = 56
| 5.13x=30 | | 5=-3x+5 | | 72=5m+7 | | 7x-19=21 | | 800-50x=y | | (X-1)/9-1=(x-9)/10 | | 8*x^2-11*x-10=0 | | 8x-25=73 | | 4x-15+2x=5+6x-19 | | 10-6v=70 | | x^2-11*x-10=0 | | 24w+234= | | 10x^2-1=489 | | 7x-3=186 | | 6x+30=90 | | 100x^2+2=3 | | X-1/9-1=x-9/10 | | 5x+20=130 | | (4x+9)=(2x+2) | | 3(x+5)+4=7 | | x+(5x-13)=140 | | 8x^2-5=763 | | 5x/28-1=x/7+1 | | 12-(x+6)=9x-4 | | 1/3Z+6=9 | | 2x+4y=14.40 | | 6x-5=6/x | | 75+X=136 | | -11x+80=-10x+5-6x | | -4(1-2x)=8x-4x+8 | | y-14=x | | 2n/5-4/13=58/65 |