Find X (step by step)

Answer:
[tex]x = 8.75[/tex]
Both the triangle are proportional to each other:
[tex]\dfrac{bigger-side}{bigger-base} = \dfrac{smaller-side}{smaller-base}[/tex]
[tex]\hookrightarrow \dfrac{x+10}{15} = \dfrac{x}{7}[/tex]
[tex]\hookrightarrow 7(x+10) =x(15)[/tex]
[tex]\hookrightarrow 7x + 70 = 15x[/tex]
[tex]\hookrightarrow 15x - 7x = 70[/tex]
[tex]\hookrightarrow 8x = 70[/tex]
[tex]\hookrightarrow x = 8.75[/tex]
Step-by-step explanation:
using similarity and enlargement to evaluate.
hence the formula
=longer distance /smaller distance
x+10/x=15/7
the cross multiply
7(x+10)=15(x)
7x+70=15x
70=15x-7x
70=8x
hence we decide by 8 both sides
x=70/8
x=8.75
that's my suggestion.