If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x+x+45=87
We move all terms to the left:
x+x+45-(87)=0
We add all the numbers together, and all the variables
2x-42=0
We move all terms containing x to the left, all other terms to the right
2x=42
x=42/2
x=21
| x+15+80=180 | | 8p+11=75 | | x-2-5x/2=9x-18 | | x-(2-5x)/2=9x-18 | | |4x-2|=7 | | (3x-3)/4=(5x-(-15) | | 2/3n-2/3=n+4/3 | | x2−18x+85=0 | | 16x+x=0 | | (3x+1)^2=8 | | e+13=20 | | 1/5x-15=4/5 | | -16x-19=113-6x | | 3=2(y+4)-7y | | (15)^x=625 | | x2+4x+68=0 | | (6a+7)/(2a-1)+(4/3)=0 | | x=(-17)=24 | | 1-3a=-2a | | .84*x=43500 | | 15=3(x+6) | | -3x+8=-12-7x | | -5(4t-2)+3t=5t-7 | | x+117+x+81=180 | | x2-18x+82=0 | | 3v^2=11+3v | | -7(5x-6)+6=-35x+48 | | x+66+x+124=180 | | 5y-(6y+7)=5y | | 4x+2-3x=-13 | | 19=14-3x | | -6(-y+4)-3(2y-3)=-y+5+5y |