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5x - 5 5(x - 1) ======
5x+1=20 5x=20-1 5x=19 5x/5=19/5 x=19/5
5x=10 5x/5=10/5 x=2
5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8