exam Maths Puzzle Numerical Ability

Can you please show me how to work this problem step by step?

-7+x+4+4x-x-3+6

Thank you!

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exam Other Question

Find the length of the altitude of an equilateral triangle whose side measures 6 feet. find the point of intersection for the lines below using the substitution
3x-4y=6
x=3y+2