Odpowiedź :
a)
[tex] - 3(x + 5) = 20 \\ - 3x - 15 = 20 \\ - 3x = 35 | \div ( - 3) \\ x = - \frac{35}{3} [/tex]
b)
[tex]2(x - 1) + 3 = 3(x + 1) \\ 2x - 2 + 3 = 3x + 3 \\ - x = 2 \\ x = - 2[/tex]
c)
[tex]2x - 3(2x - 1) = 10 \\ 2x - 6x + 3 = 10 \\ - 4x = 7 \ | \div ( - 4) \\ x = - \frac{7}{4} [/tex]
d)
[tex]4(x + 1) - 7 = 2x \\ 4x + 4 - 7 = 2x \\ 2x = 3 | \div 2 \\ x = \frac{3}{2} [/tex]
e)
[tex]3x - 7 = 2(x + 14) - 10 \\ 3x - 7 = 2x + 28 - 10 \\ 3x - 2x = 18 + 7 \\ x = 25[/tex]
Odpowiedź:
[tex]a)\\\\-3(x+5)=20\\\\-3x-15=20\\\\-3x=20+15\\\\-3x=35\ \ /:(-3)\\\\x=-\frac{35}{3}\\\\x=-11\frac{2}{3}\\\\\\b)\\\\2(x-1)+3=3(x+1)\\\\2x-2+3=3x+3\\\\2x+1=3x+3\\\\2x-3x=3-1\\\\-x=2\ \ /\cdot(-1)\\\\x=-2\\\\\\c)\\\\2x-3(2x-1)=10\\\\2x-6x+3=10\\\\-4x+3=10\\\\-4x=10-3\\\\-4x=7\ \ /:(-4)\\\\x=-\frac{7}{4}\\\\x=-1\frac{3}{4}[/tex]
[tex]d)\\\\4(x+1)-7=2x\\\\4x+4-7=2x\\\\4x-3=2x\\\\4x-2x=3\\\\2x=3\ \ /:2\\\\x=\frac{3}{2}\\\\x=1\frac{1}{2}\\\\\\e)\\\\3x-7=2(x+14)-10\\\\3x-7=2x+28-10\\\\3x-7=2x+18\\\\3x-2x=18+7\\\\x=25[/tex]