Explicación paso a paso:
3x+5+2x=90
5x=90-5
5x=85
x=85/5
x=17
3x+5=3(17)+5=51+5=56
2x=2(17)=34
-------
6x+4x=180
10x=180
x=180/10
x=18
6x=6(18)=108
4x=4(18)=72
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Verified answer
Explicación paso a paso:
3x+5+2x=90
5x=90-5
5x=85
x=85/5
x=17
3x+5=3(17)+5=51+5=56
2x=2(17)=34
-------
6x+4x=180
10x=180
x=180/10
x=18
6x=6(18)=108
4x=4(18)=72