Odpowiedź:
4.
a) ... / *4
5x-3+12=8x
5x-8x=3-12
-3x=-9 / :(-3)
x=3
b) ... / *5
5x-2x+3=15
5x-2x=15-3
3x=12 / :3
x=4
c) ... / *4
16-x=8x-2
-x-8x=-2-16
-9x=-18 / :(-9)
x=2
d) ... / *3
2x+12=x+2
2x-x=2-12
x=-10
e) ... / *5
3x-2-10=x
3x-x=2+10
2x=12 / :2
x=6
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Odpowiedź:
4.
a) ... / *4
5x-3+12=8x
5x-8x=3-12
-3x=-9 / :(-3)
x=3
b) ... / *5
5x-2x+3=15
5x-2x=15-3
3x=12 / :3
x=4
c) ... / *4
16-x=8x-2
-x-8x=-2-16
-9x=-18 / :(-9)
x=2
d) ... / *3
2x+12=x+2
2x-x=2-12
x=-10
e) ... / *5
3x-2-10=x
3x-x=2+10
2x=12 / :2
x=6