Question

a)3.(x + 2) = 27
b) 5x + 7 = 3x – 15
c)3x – 7x – 6 = 10
d) -2. ( x – 5 ) + 5 = 6
e)3x – 3 = 2x + 17


COM CALCULOS

Answer 1

Resposta:

$3*(x + 2) = 27\\\\\frac{3\left(x+2\right)}{3}=\frac{27}{3}\\\\x+2=9\\\\x+2-2=9-2\\\\x=7$

$5x + 7 = 3x - 15\\\\5x+7-7=3x-15-7\\\\5x=3x-22\\\\5x-3x=3x-22-3x\\\\2x=-22\\\\\frac{2x}{2}=\frac{-22}{2}\\\\x=-11$

$3x-7x-6=10\\\\-4x-6=10\\\\-4x-6+6=10+6\\\\-4x=16\\\\\frac{-4x}{-4}=\frac{16}{-4}\\\\x=-4$

$-2\cdot \:\left(\:x\:-\:5\:\right)\:+\:5\:=\:6\\\\-2\left(x-5\right)+5-5=6-5\\\\-2\left(x-5\right)=1\\\\\frac{-2\left(x-5\right)}{-2}=\frac{1}{-2}\\\\x-5=-\frac{1}{2}\\\\x-5+5=-\frac{1}{2}+5\\\\x=\frac{9}{2}$

$3x-3=2x+17\\\\3x-3+3=2x+17+3\\\\3x=2x+20\\\\3x-2x=2x+20-2x\\\\x=20$