Find the unknown x.9x-3.2x = 8.12 4 / 15: x = 1.36:17

9X-3.2X=8.12
5.8X=8.12
X=8.12÷5.8
X=1.4
4 / 15: x = 1.36:17
1.36X=17×4/15
1.36X=68/15
X=68/15÷1.36
X=10/3

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