2x+4(12-x)=36 2x+48-4x=362x+4(12-x)=362x+48-4x=3648-2x=36x=6

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2x+4(12-x)=36 2x+48-4x=362x+4(12-x)=362x+48-4x=3648-2x=36x=6

2x+4(12-x)=36 2x+48-4x=362x+4(12-x)=362x+48-4x=3648-2x=36x=6
2x+4(12-x)=36 2x+48-4x=36
2x+4(12-x)=36
2x+48-4x=36
48-2x=36
x=6

2x+4(12-x)=36 2x+48-4x=362x+4(12-x)=362x+48-4x=3648-2x=36x=6
听得懂吗