Question 7
Replace every symbol $\odot$ in $1\odot2\odot3\odot4\odot\cdots\odot29\odot30=2\odot3\odot2$ with $+$ or $-$ to make a correct equality. What is the greatest number of plus signs, counting both sides? Calculate from left to right; a smaller number cannot have a larger number subtracted from it. Show your reasoning.
