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+(3*x)/2 = 15 // - 15
x+(3*x)/2-15 = 0
5/2*x-15 = 0 // + 15
5/2*x = 15 // : 5/2
x = 15/5/2
x = 6
x = 6
| 6a-1=a+14 | | (3/d)=(18/3) | | 42-4/3 | | 42/4/3 | | 7x+11y=100 | | (9/y+1)=(18/54) | | x+3x+15=121 | | (R/21)=(3/63) | | 3a+7=5 | | (4/6)=(8/r) | | (R+1/4)=(3/4) | | 53t=477 | | m/17=14 | | k+32=48 | | (0.1/2)=(0.5/r) | | 4*x*3=3 | | (1/t)=(5/3) | | (-3/x)=(2/8) | | 9k/17+8=161 | | 14x/9-1=125 | | q/8+1=5 | | 23x+11y=2 | | t*15-5=40 | | m*9+3=30 | | q-9=17 | | 7(v+4)-3v=2(2v+4)-15 | | 2.5(b-12.4)=19 | | 0.45(12)+0.05x=0.15(18+x) | | (8)+(-4)+(-7)+20= | | (3X-48)+156=180 | | 17(a+8)=190.4 | | 12x^2=5+4x |