Question

galera me ajuda aqui pvf

a)3×+5=8
b)10×-19=21
c)9×+5=4×
d)7×+11=15+5×​

Answer 1

bom dia !!!

$\sf \: a)3x+5=8 \\ \sf \: 3x = 8 - 5 \\ \sf \: 3x = 3 \\ \sf \: x = \frac{3}{3} = 1$

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$\sf \: b)10x-19=21 \\ \sf \: 10x = 21 + 19 \\ \sf \: 10x = 40 \\ \sf \: x = \frac{40}{10} = 4$

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$\sf \: c)9x+5=4x \\ \sf \: 9x - 4x = - 5 \\ \sf \: 5x = - 5 \\ \sf \: x = \frac{ - 5}{5} = - 1$

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$\sf \: d)7x+11=15+5x \\ \sf \: 7x - 5x = 15 + 11 \\ \sf \: 2x = 26 \\ \sf \: x = \frac{26}{2} = 13$

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