Question

resolva as equações a seguir
a) 6x+2=-7+3x

b) x/5 + 3x/2=34

c) 2x-4/3 + 8x+5/2=7 me ajudeeeeeem
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Answer 1

Explicação passo-a-passo:

a)

$\sf 6x+2=-7+3x$

$\sf 6x-3x=-7-2$

$\sf 3x=-9$

$\sf x=\dfrac{-9}{3}$

$\sf \red{x=-3}$

b)

$\sf \dfrac{x}{5}+\dfrac{3x}{2}=34$

$\sf mmc(2,5)=10$

$\sf 2x+5\cdot3x=10\cdot34$

$\sf 2x+15x=340$

$\sf 17x=340$

$\sf x=\dfrac{340}{17}$

$\sf \red{x=20}$

c)

$\sf \dfrac{2x-4}{3}+\dfrac{8x+5}{2}=7$

$\sf mmc(2,3)=6$

$\sf 2\cdot(2x-4)+3\cdot(8x+5)=6\cdot7$

$\sf 4x-8+24x+15=42$

$\sf 28x+7=42$

$\sf 28x=42-7$

$\sf 28x=35$

$\sf x=\dfrac{35}{28}$

$\sf \red{x=\dfrac{5}{4}}$