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3x - 2x = 80 - 30
x = 50
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10 - 5x = 18 - 3x
- 5x + 3x = 18 - 10
- 2x = 8
x = -8/2
x = - 4
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4x + 3 = 48 + x
4x - x = 48 - 3
3x = 45
x = 45/3
x = 15
3X-2X = 80-30 -5X+3X= 18-10 4X-X= 48-3
5X = 50 -2X= 8 3X= 45
X= 50/5 X= 8/-2 X=45/3
X = 10 X= -4 X= 15