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x=3I *2
...2x..=.6..... I+3
..2x+3...=..9.... I -5x
..-3x+3...=.9-5x..... I +1
..-3x+4...=...10-5x... I *2
.-6x+8....=..20-10x....
b)
x= -1I +4x
..5x...=...4x-1... I -3
..5x-3...=...4x-4... I +2
..5x-1...=...4x-2... I *(-1)
..-5x+1...=...-4x+2... I +4
..-5x+5...=..-4x+6....