Chapter 1 - Graphs - 1.2 Graphs of Equations in Two Variables; Intercepts; Symmetry - 1.2 Assess Your Understanding - Page 16: 1

$x=-6$

Multiply the 2 with each term in the brackets: $2x+6-1=-7$ Combine like terms on the lest side of the equation: $2x+5=-7$ Isolate the $x$-term: $2x=-7-5$ Combine like terms on the right side of the equation: $2x=-12$ Divide both sides by 2: $\frac{2x}{2}$ =$\frac{-12}{2}$ Final answer: $x=-6$