book Maths Puzzle Numerical Ability

Solve and check the equation -7 + 4m = 6m - 5

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book Other Question

If there is a cylinder 60ft high and 20ft in diameter and it is two thirds full how much water is in it use 3.14 for pi. thanks i need it ! If x^2+y=62
y^2+x=176
find out the value of
x+y