4/X+3=2/3
how can i solve this. i want to understand what i'm going to do when it's fractions on both sides.
2X/5=X+4/3
Unfortunately you didn't use grouping brackets to be clear. I assume that you mean
$\displaystyle \frac4{x+3} = \frac23$ ............................... instead of $\displaystyle \frac4x + 3 = \frac23$
Multiply by the denominators and cancel:
$\displaystyle \frac{4\cdot 3 \cdot (x+3)}{x+3} = \frac{2\cdot 3 \cdot (x+3)}3$
$\displaystyle 12 = 2x + 6$
Solve for x.
The 2nd question should be done in a similar way.