exam Maths Puzzle Numerical Ability

What is -y + 10 = 25? I did:
-y + 10 = 25
-25 -25
-y = -15
-1(-y) = -1(-15)
y = 15
Am I right?

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exam Other Question

Solve each problem
Section 10.3, page 648
Problem 66) Stabilization ratio. The stabilization ratio (births/deaths) for South and Central America can be modeled by the formula y "Find three consecutive even numbers whose sum is -90"

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