解方程3x7+7x=42(x+4)除0.2=3514.5x+25x=518x(x+3.2)=64.8(x-1.6)除11=2

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解方程3x7+7x=42(x+4)除0.2=3514.5x+25x=518x(x+3.2)=64.8(x-1.6)除11=2

解方程3x7+7x=42(x+4)除0.2=3514.5x+25x=518x(x+3.2)=64.8(x-1.6)除11=2
解方程
3x7+7x=42
(x+4)除0.2=35
14.5x+25x=51
8x(x+3.2)=64.8
(x-1.6)除11=2

解方程3x7+7x=42(x+4)除0.2=3514.5x+25x=518x(x+3.2)=64.8(x-1.6)除11=2
3x7+7x=42 21+7x=42 7x=21 x=3
(x+4)除0.2=35 5x+20=35 5x=15 x=3
14.5x+25x=51 39.5x=51 x=51分39.5
8x(x+3.2)=64.8
(x-1.6)除11=2 x-1.6=22 x=23.6

3x7+7x=42
21+7x=42
7x=42-21
7x=21
x=21÷7
x=3