Simple Equation...

If $$3x-4=0$$ then $$x$$ is equal to

If $$a+5=7$$ find $$a$$

If $$2p=34$$ then $$4p =$$ ? 

$$x = -1$$ is a solution of the equation

Which equation among the following don't have $$(-1)$$ as a solution?

If $$8x-3=25+17x$$, then $$x$$ is:

What is the method of finding a solution by trying out various values for the variable called?

Arpita's present age is thrice of Shilpa. If Shilpa's age three years ago was $$x$$. Then Arpita's present age is

If $$\dfrac{x+6}{3} = 7$$, what is the value of $$x$$? ( using trail and error method)

What value of $$x$$ that makes the following equation true ( using trail and error method) ?
$$\dfrac{x+5}{2} = 3$$