Question

0.75x-0.5x=-3 solve and check the solution

Answer 1

$0.75x-0.5x=-3\\\\(0.75-0.50)x=-3\\\\0.25x=-3\ \ \ \ \ \ |\text{multiply both sides by 4}\\\\4\cdot0.25x=(4)(-3)\\\\1x=-12\to\boxed{x=-12}\\\\check:\\\\L=(0.75)(-12)-(0.5)(-12)=-9+6=-3=R\\\\CORRECT$

Answer 2

.25x = -3

divide both sides by .25

x = -12

plug -12 into the equation to check

.75(-12) - .5(-12)

-9 +6

-3