If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x+3x=90
We simplify the equation to the form, which is simple to understand
x+3x=90
We move all terms containing x to the left and all other terms to the right.
+1x+3x=+90
We simplify left and right side of the equation.
+4x=+90
We divide both sides of the equation by 4 to get x.
x=22.5
| 104=l*w | | .074-.26r=.035-.14r | | 104=5l+w | | 104=5+l(w) | | 104=5+lw | | 2x+7x^2-5=0 | | 325=-15t^2+150t+10 | | 30x^2-7x-15=0 | | 4x^4+24x^3+32x^2=0 | | Cb=-2x | | 8y=1/2(5y+55) | | p+22=35 | | Cb=2x | | 325t=-15t^2+150t+10 | | j+7=90 | | 1/2(3x+42)=27 | | 64=-4h | | 4c=180 | | j+4=91 | | 16.99=n+2.29 | | a+a+16=25 | | -cb=2x | | 3g=11.1 | | t+3.35=19.55 | | 2x=-cb | | 3y=7.2 | | 24+2x=0 | | y+5y+66=360 | | -x+2=-1 | | 3w+4w+5w=360 | | 8x+5=-3 | | 2x^3+x^2-5x+2=0 |