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6x - 12x = -2 - 1
-6x = -3
x = 1/2
2. 2x - 1 = 5x - 10
2x-5x = -10+1
-3x = -9
x = 3
3. 5x + 2y = 12 | x2
2x + 5y =9 |x5
10x + 4y = 24
10x + 25y = 45
_____________ _
-21y = -21
y = 1
5x +2y = 12 , y =1
5x +2 = 12
5x = 10
x = 2