book Maths Puzzle Numerical Ability

Hello, we spent an entire period trying to work this one out. PLease help me solve it. there is no division, the slash marks are fractions.
x + 5/8 + 3x/4 =2/3 +5x

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book Other Question

how do i disstrebuet how do i know which one is irrational and rational?
A. .67
B. 3 radical 4
C. -
.4
D. 3.14333....