Question

resolva as equaçoes a seguir

2x+7x-10=4x+3-2x

3x+1=0

8x+20=30

Answer 1

2X+7X-10=4X+3-2X
9X-4X+2X=3+10
7X=13
X=13÷7
X=1.85 (aproximadamente)


3X+1=0
3X=0-1
X=1÷3
X=0.33 (aproximadamente)


8X+20=30
8X=30-20
8X=10
X=10÷8
X=1.25

Answer 2

$a) \\ 2x+7x-10=4x+3-2x \\ 9x-10=2x+3 \\ 9x-2x=3+10 \\ 7x=13 \\ x= \frac{13}{7} \\ \\ S=\{ \frac{13}{7} \}$

$b) \\ 3x+1=0 \\ 3x=-1 \\ x=- \frac{1}{3} \\ \\ S=\{- \frac{1}{3} \} \\ \\ c) \\ 8x+20=30 \\ 8x=30-20 \\ 8x=10 \\ \\ x= \frac{10}{8} = \frac{5}{4} \\ \\ S=\{ \frac{5}{4} \}$