book Maths Puzzle Numerical Ability

please help me solve this.

2/3 (a-3)= -1/3
please show me how you do it..

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book Other Question

Is 5+ z =x an expression? This is called Literal Equations.

Solve the equation 7w-10z+6=6w+12z-14 for w and express in the form w=az+b.