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5x+3=18
5x=18-3
5x=15 /:5
x=3
2)
4x-4=-82
4x=-82+4
4x=-78 /:4
x=-19,5
3)
10(3x+2)=70
30x+20=70
30x=70-20
30x=50 /:30
x=50/30
x=1 20/30
x=1 2/3
4)
4x+6=7x+9
4x-7x=9-6
-3x=3 /:(-3)
x=-1
5)
-11x+6(x-2)=4x-7(5-2x)
-11x+6x-12=4x-35+14x
-5x-18x=-35+12
-23x=-23 /:(-23)
x=1
6)
x/5-6=x-14
x/5-x=-14+6
x/5-x=-8 /*5
x-5x=-40
-4x=-40 /:(-4)
x=10
7)
3x - x-3 = x+2
----- --------- --------- /*30
5 2 3
30*3x 30(x-3) 30(x+2)
---------- - ----------- = -------------
5 2 3
6*3x-15(x-3)=10(x+2)
18x-15x+45=10x+20
3x-10x=20-45
-7x=-25 /:(-7)
x=25/7
x=3 4/7
8)
y-3 y-1 y+2
----- + ------- = ------- -1 /*36
12 6 9
36(y-3) 36(y-1) 36(y+2)
----------- + ------------- = ------------- -1*36
12 6 9
3(y-3)+6(y-1)=4(y+2)-36
3y-9+6y-6=4y+8-36
9y-4y=-28+15
5y=-13 /:5
y=-13/5
y=-2 3/5
5x+3=18
5x=18-3
5x=15/:5
x=3
2.
4x-4=-82
4x=-82+4
4x=-78/:4
x=-19,5
3.
10(3x+2)=70
30x+20=70
30x=70-20
30x=50/:30
x= 1 cała 20/30
4.
4x+6=7x+9
4x-7x=9-6
-3x=3/: (-3)
x=-1
5.
-11x+6(x-2)=4x-7(5-2x)
-11x+6x-12=4x-35+14x
-11x+6x-4x-14x=-35+12
-23x=-23/: (-23)
x=1
6.
x/5 -6=x-14/ *5
x-30=5x-70
x-5x=-70+30
-4x=-40/:(-4)
x=10
7.
3x/5 - x-3/2= x-2/3
18x/30 - 15(x-3)/30=10(x+2)/30
18x/30 - 15x-45/30= 10x+20/30/ *30
18x-15x-45=10x+20
18x-15x-10x=20+45
-7x=65/ :(-7)
x=-9 całych 2/7