Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.8 Solving Equations - A.8 Assess Your Understanding - Page A70: 15

Answer

$x=-18$

Work Step by Step

Distribute $2$ on the left side of the equation and $3$ on the right side: $$2(3+2x)=3(x-4)\\ 6+4x=3x-12$$ Combine like terms by subtracting $3x$ to both sides first, then subtracting $6$ to both sides after: $$ 6 + 4x-3x = 3x - 12-3x\\ 6+x=-12\\ 6+x-6=-12-6\\ x=-18 $$
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