[tex]\displaystyle 56(x+4)+64x=584\\56x+224+64x=584\\120x+224=584\\120x=584-224\\120x=360\\x=3[/tex]
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[tex]\displaystyle 56(x+4)+64x=584\\56x+224+64x=584\\120x+224=584\\120x=584-224\\120x=360\\x=3[/tex]