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what is 3x 3y=21 y=-x 7 Im not sure how to solve this problem

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Posted By: christeena
Date: 14/01/2021
Academic Level: High School
Paper Type: Dissertation & Thesis Writing

### Question Description

what is 3x+3y=21 if y=-x+7

Category: Engineering & Sciences
Subjects: Chemistry
Deadline: 24 Hours
Budget: $60 - $90
Pages: 2-3 Pages (Short Assignment)