exam Maths Puzzle Numerical Ability

Solve and check each of the following equations for x. This is easy and i think I am thinking to hard. Please help.
x/6 - x/8 = 1

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exam Other Question

Solve by substitution 3x -y =-7 and x+ y = -9 What is the graph of the equation x2 + 2x + 7 - y = 0?