Step-by-step explanation:
[tex]\tt{u-u+2u+3u-2u=15 }[/tex] ⠀
[tex]\tt{6u-3u=15 }[/tex] ⠀
[tex]\tt{3u=15 }[/tex] ⠀
[tex]\tt{ u=\dfrac{15}{3} }[/tex] ⠀
[tex]\tt{ u=\dfrac{\cancel{15}}{\cancel{3}} }[/tex] ⠀
[tex]\tt{u=5 }[/tex] ⠀
Answer:
