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2a - a = -3 - 1
a = -4
2. 12 + 3a = 5 + 2a
3a - 2a = 5 - 12
a = -7
3. 3(x+1)= 2(x+4)
3x + 3 = 2x + 8
3x - 2x = 8 - 3
x = 5
2a-a=-3-1
a=-4
2. 12+3a=5+2a
12-5=2a-3a
7=-a
-7=a
3. 3[x+1]=2[x+4]
3x+3=2x+8
3x-2x=8-3
x=5