Question

equação do 1 grau
a) 2x=8+10

b) 2x=10

c) 3x+10=5x-5

d) 9x+5=8x-3

Answer 1

$a) \\ 2x=8+10 \\ \\ 2x=18 \\ \\ x= \frac{18}{2}=9 \\ \\ b) \\ 2x=10 \\ \\ x= \frac{10}{2} =5 \\ \\ c) \\ 3x+10=5x-5 \\ \\ 3x-5x=-5-10 \\ \\ -2x=-15 \\ \\ x= \frac{-15}{-2}= \frac{15}{2} \\ \\ d) \\ 9x+5=8x-3 \\ \\ 9x-8x=-3-5 \\ \\ x=-8$