Answer :
[tex]\text{Hey there!}[/tex]
[tex]\mathsf{Simplify: 3x - 7y + 4x - 7y}[/tex]
[tex]\text{COMBINE your like terms: 3x, 4x \& -7y, -7y}[/tex]
[tex]\mathsf{(3x+4x)+(-7y+(-7y))}\\\\\mathsf{3x+4x=7x}\\\\\mathsf{-7y+(-7y)=-14y}\\\\\mathsf{=7x-14y}\\\\\boxed{\boxed{\mathsf{Answer: \boxed{\mathsf{7x-14y}}}}}\checkmark[/tex]
[tex]\text{Good luck on your assignment and enjoy your day!}[/tex]
~[tex]\dfrac{\frak{LoveYourselfFirst}}{:)}[/tex]