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(1)4x-x=36,
3x=36,
3x÷3=36÷3,
x=12;
(2)9x-1.8=5.4,
9x-1.8+1.8=5.4+1.8,
9x=7.2,
9x÷9=7.2÷9,
x=0.8.
3x=36,
3x÷3=36÷3,
x=12;
(2)9x-1.8=5.4,
9x-1.8+1.8=5.4+1.8,
9x=7.2,
9x÷9=7.2÷9,
x=0.8.
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