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2z = 25
z = 12,5
2. 6a - 3 = 3a + 12
3a = 15
a = 5
3. 7 - 2x = 3x - 3
10 = 5x
x = 2
4. 6 (x + 2) = 3 (x - 3)
6x + 12 = 3x - 9
3x = -21
x = -7
5. 3x - 2 < 10
3x < 12
x < 4
2z = 15+10
2z = 25
z= 25/2=12,5
2. 6a -3= 3a +12
6a-3a=12+3
3a=15
a=15/3=5
3.7-2x=3x-3
-2x-3x=-3-7
-5x=-10
x=-10/-5=2
4. 6(x+2)=3(x-3)
6x+12=3x-9
6x-3x=-12-9
3x=-21
x=-21/3=-7
5.3x-2<10
3x<10+2
3x<12
x<4