If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x-((2/5)*x) = 12.6 // - 12.6
x-((2/5)*x)-12.6 = 0
x+(-2/5)*x-12.6 = 0
3/5*x-12.6 = 0 // + 12.6
3/5*x = 12.6 // : 3/5
x = 12.6/3/5
x = 21
x = 21
| 5(3x-2)+3(2x+5)= | | 2(4x-3)-9=4+2x | | 32x+3=7779 | | 112=-8(2x-6) | | 5y-(2y-4)=-17 | | X=5/128(27) | | (3x-4)(5x+2)= | | 13=4(x-1)-(x-5) | | -2x+7y=-13 | | 8(1+5n)=-312 | | 8x-6=4x+24 | | 6(x-3)=10-2(x+2) | | 7v^2-3v-4=0 | | 2(-9-3)+21=-3 | | -7(4+8x)=-364 | | 5/128×27 | | 3(5x-2)-(14x+4)=0 | | 2j^2-3j-9=0 | | 7=d-0.9 | | 10v^2-16v=0 | | 14-(6-6n)+21=-14+24(n+1) | | -7(6-8n)=-210 | | 2(2-3x)=3(5x+3) | | 35+0.17= | | 2.7=p+1.2 | | 5/128=x/27 | | 2x-4x+1-3=-4 | | c-0.1=3 | | -7(x-4)+2=4(x+5) | | 3f+25=13 | | 10r-3(r+4)=4(3r-4)-31 | | X^2+4xy+y^4=0 |