book Maths Puzzle Numerical Ability

Please help me solve this equation:

0.5 = -2.5 + x

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book Other Question

Find all matrices with real number elements, which are the square root of:

matrix: 1 -1
-1 1 how do i solve: 1/8(16y+8)-17= -1/4(8y-16)
i need a step by step answer