To solve this equation, we need to first simplify the left side of the equation:

1.8 / 2.5 = 0.72

Now, we rewrite the equation with the simplified left side:

0.72 = 7.2 / 6x + 1

Next, we isolate the variable by subtracting 1 from both sides:

0.72 - 1 = 7.2 / 6x

-0.28 = 7.2 / 6x

Now, we can solve for x by multiplying both sides by 6 to get rid of the fraction:

-0.28 6 = 7.2 / 6x 6

-1.68 = 7.2 / x

To isolate x, divide both sides by 7.2:

-1.68 / 7.2 = x

x = -0.2333

Therefore, the solution to the equation is x = -0.2333.