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X + 1.5x = 7.5

X + 1.5x = 7.5

x+1.5x=7.5
2.5x＝7.5
x＝7.5/2.5
x＝3

5x + 2 * 8 = 20 (x + 14) / 5 = 8.6 to solve the equation

5x+2*8=20
5x+16=20
5x=20-16
5x=4
x=4/5
x=0.8
（x+14）/5=8.6
x+14=5×8.6
x+14=43
x=43-14
x=29

5x + 2 * 8 = 20 to solve the equation

5x+2*8=20
5x+16=20
5x=20-16
5x=4
x=4/5

0.9 * (9-x) = 2.70.6x + 20 = 268 / (3x + 1) = 0.25x-2 * 0.3 = 4.4

0.9*(9-X)=2.7
9-X=3
X=6
0.6X+20=26
3X+10=130
3X=120
X=40
8/（3X+1）=0.2
0.2(3X+1)=8
3X+1=40
3X=39
X=13
5X-2*0.3=4.4
5X-0.6=4.4
5X=5
X=1