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)
(5/3)*(x+y) = 15 // - 15
(5/3)*(x+y)-15 = 0
5/3*(x+y)-15 = 0
5/3*(x+y)-15 = 0
5/3*x+5/3*y-15 = 0
5/3*x+5/3*y-15 = 0
5/3*x+5/3*y-15 = 0 // - 5/3*y-15
5/3*x = -(5/3*y-15) // : 5/3
x = (-(5/3*y-15))/5/3
x = 3/5*(15-(5/3*y))
x = 3/5*(15-(5/3*y))
| 2(2z+9)= | | x+7=10x-3 | | 5+6x=17+13x | | 200x-2x^2=-x^2+60x+2400 | | -2(x+2)=-8x+1 | | 4+2/u-(3u)/(u+5) | | -(7x-7y+6)= | | 2.5x+1.2=-3.8 | | 30+3t=6th | | 12h-8=3h | | 5/3(x+4)=15 | | -(10x-8)+2x=64 | | 3-6(8+7a)= | | 1/7*2 | | 1/2n-9=4n+5 | | 3.9x-1.8+x-4.2= | | 1/2-1/8=7/8 | | C=h-t/s | | (x+9)-(8x-5)= | | 6x-4=8-x | | 7/4.5=x/27 | | z^2-2z+10=0 | | 35/198=7a/22 | | 3x/5-4y=8 | | 6x(x+10)=20 | | -11x=3 | | 3.4(3+7a)=9.2+24.8a | | 3x/5-4=8 | | -15=-3(-2x)+13 | | 6x(7x+7)=7(6x+6) | | -12m=144 | | (4x-80)=60 |