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8z=8z+4 0=4 there r no solutions
8z=4(2z+1) ... Start with the given equation.
8z=8z+4 ... Distribute.
8z-8z=4 ... Subtract 8z from both sides.
0z=4 ... Combine like terms on the left side.
0=4 ... Simplify.
Since this equation is never true for any z value, this means that there are no solutions.