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12.4x-7.8x=23 4.6x=23 x=23÷4.6 x=5 5(x-1.9)=10.5 5x-9.5=10.5 5x=20 x=4 3x-2.6x = 0.25 times 2 0.4x=0.5 x=5/4 x=1.25
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