5x+6x=33 5.8m-4.5m=7.8 y-0.28y=12 4.2n+2.5n=13.4

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5x+6x=33
(5+6)x=33
11x=33
x=33÷11
x=3
5.8m-4.5m=7.8
（5.8-4.5）m=7.8
1.3m=7.8
m=7.8÷1.3
m=6
y-0.28y=12
(1-0.28)y=12
0.72y=12
y=12÷0.72
y=16又2/3
4.2n+2.5n=13.4
(4.2+2.5)n=13.4
6.7n=13.4
n=13.4÷6.7
n=2

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