book Maths Puzzle Numerical Ability

Please help me solve this equation:

0.5 = -2.5 + x

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book Other Question

Graph the following

3x - 4y is less than or equal to 12

Thank you! A deliver truck has a load of 840 items you ordered. If it takes1 1/2 minutes to unload a dozen of items , how long will it take to unload all of them?
I got 70 min by dividing 12