7. Resolva as Equações em R
a) 2 x + 6 = x + 18
b) 5 x 3 = 2 x + 9
c) 3 ( 2 x - 3 ) + 2 ( x + 1 ) = 3 x + 18
d) 2 x . + 3 ( x - 5 ) = 4 x + 9
a) 2 x + 6 = x + 18
b) 5 x 3 = 2 x + 9
c) 3 ( 2 x - 3 ) + 2 ( x + 1 ) = 3 x + 18
d) 2 x . + 3 ( x - 5 ) = 4 x + 9
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[tex]a) 2x+6 = x + 18\\ 2x-x = 18-6\\ x = 12\\\\b) 5x + 3 = 2x + 9\\5x-2x = 9-3\\3x=6\\x=\frac{6}{3} \\x=2\\\\c) 3(2x-3)+2(x+1) = 3x+18\\6x-9+2x+2=3x+18\\6x+2x-3x=18+9-2\\5x=25\\x=\frac{25}{5} \\x=5\\\\d) 2x+3(x-5) = 4x+9\\2x+3x-15=4x+9\\5x-4x=9+15\\x=24\\\\\\[/tex]
Espero ter ajudado, fiz conforme está escrito cada alternativa.