7.8X+7.2X=45

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7.8X+7.2X=457.8X+7.2X=457.8X+7.2X=457.8X+7.2X=4515X=45X=37.8X+7.2X=45(7.8+7.2)X=4515X=45X=315X=45X=3

7.8X+7.2X=45
7.8X+7.2X=45

7.8X+7.2X=45
7.8X+7.2X=45
15X=45
X=3

7.8X+7.2X=45
(7.8+7.2)X=45
15X=45
X=3

15X=45
X=3

7.8X+7.2X=45
15X=45
X=3

7.8X+7.2X=45
15X=45
X=3