If it's not what You are looking for type in the equation solver your own equation and let us solve it.
90=-15x
We move all terms to the left:
90-(-15x)=0
We get rid of parentheses
15x+90=0
We move all terms containing x to the left, all other terms to the right
15x=-90
x=-90/15
x=-6
| 3m+15=39 | | 4(5n-1)=36 | | F(n)=45•(4/5)^n-1 | | w2+28w+52=0 | | -2(s-6)=2 | | 23/7+1/3=x | | 7(3-x)-2(x+1)=1 | | 2(2n+3)=22 | | 4-2x+3=-3(x-4) | | 16x−4x=-48 | | (3-x)-2(x+1)=1 | | 4x+34=x+7 | | (3x-4)+(8-14)=180 | | –3.3x+6.5=1.55 | | –3.3x6.5=1.55 | | 14=7+2n+5n | | 15x-2+8x=6x-11 | | 3(r-7)+1=4 | | –6.4z+102=2 | | 12d+1=4d+65 | | -x-2=5x+4 | | -7+2x=-6-71 | | 2-(7x-3)=-9 | | 2(n+2)=2n+3 | | x/3-0.5=5/6 | | (10x+2)+88=180 | | c=500-20 | | 1/4(n+2)=9 | | 2=–6.4z+10 | | p(-9)=(-9)^2+(-9) | | -2+8b=-42 | | x/3+4=19 |