U can use Substitution 1.5x-18=4x-28 then u can subtract 1.5-4 and get -2.5 or 4-1.5 and get 2.5 it doesn’t matter after that you add 28 to -18 and get 10 or 18 to -28 and get -10 doesn’t matter then you have -2.5x=-10 and or 2.5x=10 and ur answer is X=4
well the other cathet is 2 square roots of 3. since the angles are 30° and 60° cathecathet is 2 times longer than the known. and to calculate x we use pythagoras teorem. witch leads me to an answer square root of 15
