hello
the question here requires we solve the perimeter of an equilateral triangle
an equilateral triangle has all it's sides equal
[tex]\begin{gathered} \text{perimeter of an equilateral triangle }=\text{ 3L} \\ L=\text{length of it's sides} \end{gathered}[/tex]
length = 2x - 1
perimeter = 3l
substitute the value of the length into the formula
[tex]\begin{gathered} \text{perimeter = 3L} \\ 63=3(2x-1) \\ \text{open the bracket and solve for x} \\ 63=6x-3 \\ \text{collect like term} \\ 63-3=6x \\ 60=6x \\ \text{divide both sides by 6} \\ \frac{60}{6}=\frac{6x}{6} \\ x=10 \end{gathered}[/tex]
the value of x equals 10
