Explicación paso a paso:
-30+6x+3x+30+90=180
9x+90=180
9x=180-90
x=90÷9
x=10
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Verified answer
Explicación paso a paso:
-30+6x+3x+30+90=180
9x+90=180
9x=180-90
x=90÷9
x=10