Resposta:
A) x = 4
B) x = 5
C) y = - [tex]\frac{2}{5}[/tex] ou y = -0,4
D) x = 1
Explicação passo a passo:
[tex]A) \\10x-19=21\\\\10x=21+19\\\\10x=40\\\\x=\frac{40}{10}\\\\x=4\\\\\\\\B) \\x+2x+3=18\\\\3x+3=18\\\\3x=18-3\\\\3x=15\\\\x=\frac{15}{3} \\\\x=5\\\\\\\\C) \\9y+8=14y+10\\\\9y-14y=10-8\\\\-5y=2\\\\-y=\frac{2}{5} \\\\-y=0,4\\\\y=-0,4\\\\[/tex]
[tex]D) \\6x+4x+12-3x=12+10-8+5x\\\\10x+12-3x=22-8+5x\\\\7x+12=14+5x\\\\7x-5x=14-12\\\\2x=2\\\\x=\frac{2}{2} \\\\x=1[/tex]
Espero ter ajudado , se precisar estamos aqui a disposição.
(Se realmente merecermos , marque como melhor resposta para nos ajudar) ❤️
