S(5-6x)dx

To solve this indefinite integral, we need to first distribute the x term inside the parentheses:

∫(5-6x)dx
= ∫5 dx - ∫6x dx
= 5x - 3x^2 + C
= 5x - 3x^2 + C

So the indefinite integral of (5-6x)dx is 5x - 3x^2 + C, where C is the constant of integration.