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4x - 2x = 10 + 8
2x = 18
x = 9
2x - 1 < 11 - x
2x + x < 11 + 1
3x < 12
x < 4
4x-2x=10+8
2x=18
x=18/2=9
b. 2x-1<11-x
2x+x<11+1
3x<12
x<12/3
x<4