Add one on both sides of the equation. You would end up with -6=x/3. You would then cross multiply, so -6 times 3 and 1 (the denominator for -6) times x and you would get -18=x
Follow BEDMASS. [tex]-7=-1+x/3[/tex] Add 1 to both sides. [tex](-7)+1=(-1+x/3)+1[/tex] [tex]-6=x/3[/tex] Multiply both sides by 3. [tex](-6)*3=(x/3)*3[/tex] [tex]-18=x[/tex]