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(1)2x+3×0.9=24.9,
2x+2.7=24.9,
2x+2.7-2.7=24.9-2.7,
2x÷2=22.2÷2,
x=11.1;
(2)4x-1.6x=36,
2.4x=36,
2.4x÷2.4=36÷2.4,
x=15;
(3)2x÷5=15,
2x÷5×5=15×5,
2x÷2=75÷2,
x=37.5.
2x+2.7=24.9,
2x+2.7-2.7=24.9-2.7,
2x÷2=22.2÷2,
x=11.1;
(2)4x-1.6x=36,
2.4x=36,
2.4x÷2.4=36÷2.4,
x=15;
(3)2x÷5=15,
2x÷5×5=15×5,
2x÷2=75÷2,
x=37.5.
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