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)
(5/4)*x-((2/5)*x)-13 = 21 // - 21
(5/4)*x-((2/5)*x)-21-13 = 0
(5/4)*x+(-2/5)*x-21-13 = 0
17/20*x-34 = 0 // + 34
17/20*x = 34 // : 17/20
x = 34/17/20
x = 40
x = 40
| (5/9e)-1(-1/3e)=3 | | Y=m-2 | | 12x+192=4x | | 4x^2+30=29x | | y-dx=bx^2 | | 35y+13=13 | | 38x+5y=550 | | 2x(x^2+2x-6)= | | x+(3x-5)+2(3x-5)=65 | | 1.8c+32=50 | | 6w-6+4(2w+3)=-2(w+6) | | 1.8c+32=41 | | 1n(x+1)=1 | | 8y+4=7y+3 | | 6-2x=-4+8x | | 535/y | | ((-4j-(-5)/-7)=13 | | 8x+4=7y+3 | | 18+-1(y+2)=21 | | 14x+12=-14-9x | | -10ln[93.7-76.5/98.6-76.5] | | 0=-260+2x^2-6x | | (-4j-(5)/-7)=13 | | 4(6-x)=28-3x | | 13-4y=7 | | 36-3*2/9-6= | | 9-2v=v | | 7-7n+2n=10-98 | | z/7-8=2 | | 9(2+11a)= | | -16=2.5 | | 9+x-x^2=0 |