Combine like terms. First, add 4.2x to both sides. This results in 1.8+0.5x = 0.3, and then 0.5x = 0.3-1.8.
Next, 0.05x = -1.5, or 5x = -150, and x = -30.
Must check this result by substitution of -30 for x in the original equation.
Is 1.8-3.7(-30)=-4.2(-30)+0.3 true or false?
