Solve the equation 3.4x-0.9x = 7.5

Solve the equation 3.4x-0.9x = 7.5

2.5x=7.5
x=3

Solving equation: (4x + 7) / (9x + 7) = 3 / 5

0 solution equation: (4x + 7) / (9x + 7) = 3 / 5
3(9x+7)=5(4x+7)
27x+21=20x+37
7x=16
x=16/7
Take it

The solution equation of 5x + 8x = 0.39

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（5+8）x =0.39
13X =0.39
X =0.39÷13
X=0.03
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X / 12 + 4x / 24 = 1 to solve the equation

Multiply the left and right sides of the equation by 24 to get 2x + 4x = 24
6x=24
x=4

Solution equation: 7.8x-2.4x = 1.082x-2.8 times 0.5 = 8.962 times (x + 1) = 6

7.8X-2.4X=1.082X-2.8X×0.5=8.962×（X+1）=6
5.4X=6
X=10/9

How to solve equation 1.6x = 4.8x-11.2

4.8x-1.6x=11.2
3.2x=11.2
x=3.5

Solve the equation (4 + 6x) / 3 = (2 + 8x) / 2. Note that / is a division sign

(4+6x)/3=(2+8x)/2
2×（4+6x）=3×（2+8x）
8+12x=6+24x
24x-12x=8-6
12x=2
x=1/6

4.8x+6x*0.7=54

4.8x+6x×0.7=54
4.8x+4.2x=54
9x=54
x=54÷9
x=6

Solution equation: 8x - (6x-10) = 230

8X-6X+10=230
2X=230-10
2X=220
X=110

8x-6 = 30 + 6x

8x-6=30+6x
8x-6x=30+6
2x=36
x=36÷2
x=18