exam Maths Puzzle Numerical Ability

Please show me how to solve the equation and check the answer. Thanks!

0.05(z+20)=0.1z-0.5

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exam Other Question

Solve algebraically using one variable. Find three consecutive even integers such that the product of the smallest integer and the middle integer is eight less than eleven times the largest integer. Thanks for the help. 4x+5y=-16
-2x+5y=12

Solve for x and y.