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x = 13+9
x = 22
2b. 17-x=-16
17+16= x
33 = x
3b. 3x-10=-4
3x = 10-4
3x = 6
x = 2
4a. 3x+4 = 12-x
3x+x = 12-4
4x = 8
x = 2
b. 5x-2 = 2x+19
5x-2x = 19+2
3x = 21
x = 7
5a. 2(x+2)=x-1
2x+4 = x-1
2x-x = -1-4
x = -5
b. 5(x-5) = 2x-7
5x-25 = 2x-7
5x-2x = -7+25
3x = 18
x = 6