If it's not what You are looking for type in the equation solver your own equation and let us solve it.
C in (-oo:+oo)
1/2 = (2/5)*C-3 // - (2/5)*C-3
1/2-((2/5)*C)+3 = 0
(-2/5)*C+1/2+3 = 0
7/2-2/5*C = 0 // - 7/2
-2/5*C = -7/2 // : -2/5
C = -7/2/(-2/5)
C = 35/4
C = 35/4
| 2x-5*2x=180 | | 7-6x+8=3(x+8) | | b/13-3/b=8/13 | | -4-6q=-5q | | 6(x(2))+8x=280 | | 17=3x+7 | | 6m+3=2m-4/2 | | 3/4k-1=4 | | 3x/0.5=0.6 | | 7x-8=3x-7+5z | | 5/7*5/7= | | 2(x+7)=5(x-4) | | 2x+7(3x-15)=148 | | (1.5*h)/2=10 | | 6(x(2))=8x | | 4n-18=2(2n-7) | | 13=16.66Y+2x | | (10x/3)=(27/0.1x) | | 3x+(x-2)-2=6 | | 400c+120=2600 | | x+x+x+5+x+5=74 | | 81a^2-64= | | (3p^2/m)(m^2/r) | | 25-5x=4(1+4x) | | (5+i)+(7-2i)= | | 4x+10=-30 | | 2(5-2y)=5y+3(y-4)-7 | | 6x-2=x+14 | | -256=8(-12+r) | | -26+x=x+28 | | 1/3+g=9/2 | | 5x+y=-6 |