5（2.5-x）=8.5
2.5-x=1.7
x=2.5-1.7
x=0.8
13+x=28.5
x=28.5-13
x=15.5
2.4x=26.4
x=26.4÷2.4
x=1.1
7.5x-3.5x=19
4x=19
x=19÷4
x=4.75
5（2.5-x）=8.5
2.5-x=1.7
x=2.5-1.7
x=0.8
13+x=28.5
x=28.5-13
x=15.5
2.4x=26.4
x=26.4÷2.4
x=11
7.5x-3.5x=19
4x=19
x=19/4
1 x = 2.5 - (8.5 / 5) = 0.6
2 x = 28.5 - 13 = 15.5
3 x = 26.4 / 4 = 6.6
4 x = 19 / (7.5 - 3.5) = 4.75
4x-2
.3=8.7
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