Question

Resolva : -7x = 7
2x + 3 = 15
7x - 1 = 13
2x - 4 = - 3
4x + 2 - 18
5x - 2 = 7+6
10x + 1 = - 4 - 5
X\2 = 8
X\3 = -8
2x \3 = -10

Answer 1

$a)-7x=7 \\ \\ x= \frac{7}{-7} \\ \\ x=-1 \\ \\ b)2x+3=15 \\ \\ 2x=15-3 \\ \\ 2x=12 \\ \\ x= \frac{12}{2} \\ \\ x=6 \\ \\ c)7x-1=13 \\ \\ 7x=13+1 \\ \\ 7x=14 \\ \\ x= \frac{14}{7} \\ \\ x=2$

$d)2x-4=-3 \\ \\ 2x=1 \\ \\ x= \frac{1}{2} \\ \\ e)4x+2=-18 \\ \\ 4x=-20 \\ \\ x= \frac{-20}{4} \\ \\ x=-5 \\ \\ f)5x-2=7+6 \\ \\ 5x=13+2 \\ \\ 5x=15 \\ \\ x= \frac{15}{5} \\ \\ x=3$

$g)10x+1=-4-5 \\ \\ 10x=-9-1 \\ \\ 10x=-10 \\ \\ x= \frac{-10}{10} \\ \\ x=-1 \\ \\ h) \frac{x}{2} =8 \\ \\ x=8*2 \ \ // x=16 \\ \\ i) \frac{x}{3} =-8 \\ \\ x=-8*3 \ \ // x=-24 \\ \\ j) \frac{2x}{3} =-10 \\ \\ 2x=-10*3 \\ \\ 2x=-30 \\ \\ x= \frac{-30}{2} \\ \\ x=-15$

Agora sim! Boa tarde e bons estudos!