rozwiąż równania
a) - 3 (x +2) - 2 (x + 3) = -7
b) 2 (2x+5)-3(5+x)=4(x+3)+2(2x+2)
c) 4 (2x-8) - 6 (x-4)=2
d) -3(x-2)+2(2x-3) =-7(3-x)+5(1-2x)
Wyniki : a) -1 b) -3 c) 5 d) -1
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a) -3x-6-2x-6=-7
-5x-12=-7
-5x=5 ¦:-5
x=-1
b) 4x+10-15-3x=4x+12+4x+4
x-5=8x+16
x=8x+21
-7x=21
x=-3
c) 8x-32-6x+24=2
2x-8=2
2x=10
x=5
d)-3x+6+4x-6=-21+7x+5-10x
x=-16-3x
4x=-16
x=-4