exam Maths Puzzle Numerical Ability

Solve for each formula for the specific variable

V=1/3Bh Solve for h

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exam Other Question

Variables on Both Sides

Please show me the steps. The answer is a -3

4a-8=9a+7
a=______

Thank you very much!

2(x-3)-3(x + 5)=3(x-2)-7