If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x+15=(-21)
We move all terms to the left:
x+15-((-21))=0
We add all the numbers together, and all the variables
x+36=0
We move all terms containing x to the left, all other terms to the right
x=-36
| -2y+26=-6(y-5) | | x²+27=+31 | | (4x-3)=180 | | 7m+8=–5m+8+m | | -42=-6k | | 5x2=3x4 | | x+25=(-21) | | -8j+2j=36-18 | | 3x-4+10=2x+12 | | -4y+7=6y+67 | | a+a/2=3011 | | 2(3x+9)=-49+19 | | -19+5=-5+3(4v+9) | | 5×x+2=97 | | x=100+0.3 | | 4b+3=-b-47 | | -11x-10=14-3x | | 12y+-12=11y+22 | | 2b/3=3 | | 4=5n+1-6n | | -0.3(n-2.1)0.9=-0.2(2n-1.2) | | 14r+6=6r+13r-15 | | ⅖y=4 | | 5x=200*1000 | | 2x-14+14=82+14 | | 12y+-12y=11y+22 | | -5b+b=-8 | | -176=16c | | x-55=-40 | | 5x=200(1000) | | -2(3-y)=-8 | | 213x+5=20-x |