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X x 2,9 + X x 0,1 = 1,05
X x ( 2,9 + 0,1 ) = 1,05
X x 3 = 1,05
X = 1,05 : 3
X = 0,35
X x 2,9 + X x 0,1 = 1,05
X x ( 2,9 + 0,1 ) = 1,05
X x 3 = 1,05
X = 1,05 : 3
X = 0,35
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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a) \(101x-x+72.99+72=21050\)
\(100x+72.\left(99+1\right)=21050\)
\(100x+72.100=21050\)
\(\left(x+72\right).100=21050\)
\(x+72=210,5\)
\(x=138,5\)
b) \(x:4+x:0,125=9,9\)
\(x:\left(4+0,125\right)=9,9\)
\(x:4,125=9,9\)
\(x=40,8375\)
c) \(1,5x-5,7=5,3\)
\(1,5x=11\)
\(x=\frac{22}{3}\)
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0.336xX:0.35=0.6
0,336 * X = 0,6 * 0,35
0,336 * X = 0,21
X = 0,21 : 0,336
X = 0,625
0,336 x X : 0,35 = 0,6
0,336 x X = 0,6 x 0,35
0,336 x X = 0,21
X = 0,21 : 0,336
X = 0,625
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X x 3,6 : 0,9 = 0,17
X x 3,6 = 0,17 x 0,9
X x 3,6 = 0,153
X = 0,153 : 3,6
X = 0,0425