book Maths Puzzle Numerical Ability

I need help solveing for x:(2/3)x+4=(3/4)x+2

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book Other Question

a jar contains 5-gram bolts and 10-gram bolts. the contents of the jar weigh 2.35 KG (1000g=1KG). if there are 300 bolts altogether, how many are there of each kind? 10/y + 8/ysquared / 5 + 4/y