1) 0.11x + 0.08x = 45.6
Simplify the left side by adding the coefficients of x:
0.19x = 45.6
Divide both sides by 0.19 to solve for x:
x = 45.6 / 0.19
x = 240

2) 7x + 9x + 0.32 = 2.72
Combine like terms on the left side:
16x + 0.32 = 2.72
Subtract 0.32 from both sides:
16x = 2.4
Divide both sides by 16 to solve for x:
x = 2.4 / 16
x = 0.15

3) 0.8(x -1.9) = 0.56
Distribute 0.8 to both terms inside the parentheses on the left side:
0.8x - 1.52 = 0.56
Add 1.52 to both sides to isolate the x term:
0.8x = 2.08
Divide both sides by 0.8 to solve for x:
x = 2.08 / 0.8
x = 2.6