If it's not what You are looking for type in the equation solver your own equation and let us solve it.
900=100x+300
We move all terms to the left:
900-(100x+300)=0
We get rid of parentheses
-100x-300+900=0
We add all the numbers together, and all the variables
-100x+600=0
We move all terms containing x to the left, all other terms to the right
-100x=-600
x=-600/-100
x=+6
| (4x-6)=(6x+7) | | 21x=225 | | 7+3x=-23+8x | | 5x=(7x-26) | | a÷6=-9 | | 16.78=-1.02c | | 8n-3=46 | | 4+2x|=16 | | 6x+15=6(3-x) | | 84=8+20x | | 3(3x−3)= 27 | | -3/x+1=x-10/2x | | |-4+2x|=16 | | 8f=1/2 | | 80=-13+x | | 4.4=4.4={x}{2} | | 30+25x=365 | | -12+y=27 | | 1=3k+10 | | 60-2x=50-x | | 7^x=135 | | 20=f8 | | 6x+-4=-3x+5 | | a=0.008150 | | 15/8=n/6 | | 6=72(2x+28) | | 1.5x6=6 | | 1÷2(10k-16)+11=-2 | | 4w+2-14w-8=6w-6 | | 19.3=3.8+y0.2 | | 6v-8=-62 | | -x+15=30 |