Question

Given: 3(x-4)=2x+7
Prove: x=19

2_9

What is Reason b?

Answer 1

Please engage with the asker more so he/she can learn better. @DecentNabeel

Answer 2

Ok I am not sure you want to get this abstract, but what @DecentNabeel showed is that \(x=19\) is a solution i.e. he showed existence, if we now show that it is the only solution i.e. we show uniqueness, then we know that there is only one solution. To shows this, simply solve for \(x\) in the equation.