4x+2.1-2.1=6.5-2.1,
4x=4.4,
4x÷4=4.4÷4,
x=1.1;
②x:8=
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x=5;
③2x+2×0.7=4.5,
2x+1.4-1.4=4.5-1.4,
2x=3.1,
2x÷2=3.1÷2,
x=1.55;
④x:8=
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x=10.
①4x+3×0.7=6.5 | ②x:8=
| ③2x+2×0.7=4.5 | ④x:8=
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