exam Maths Puzzle Numerical Ability

I am not sure how to do:

+2x-4=x+2, then x=

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exam Other Question

Can someone help me on this problem?

Which property of the real numbers is illustrated by the following statement?

7 + 8 = 8 + 7

Thanks,
Lisa How do I write an equation of a line with the given slope and y-intercept?