Question

resolva as equações
x=-2x - 30
x-1=2x+5
4a=-12
6x-21=3
10x=20
-30=15x
28=7x

Answer 1

x=-2x-30   x+2x=-30   3x=-30   x=$\frac{-30}{3}$   x=-10
x-1=2x+5  x-2x=5+1   -x=6 (-1)    x=-6
4a=-12   a=$\frac{-12}{4}$   a=-3
6x-21=3    6x=3+21   6x = 24   x=$\frac{24}{6}$    x=4
10x=20   x=$\frac{20}{10}$   x=2
-30=15x    x=$\frac{-30}{15}$   x=-2
28=7x     x=$\frac{28}{7}$   x=4