0.3+1.8=0.4(x+5)2

Solution for 0.3+1.8=0.4(x+5)2 equation:

Simplifying
0.3 + 1.8 = 0.4(x + 5) * 2

Combine like terms: 0.3 + 1.8 = 2.1
2.1 = 0.4(x + 5) * 2

Reorder the terms:
2.1 = 0.4(5 + x) * 2

Reorder the terms for easier multiplication:
2.1 = 0.4 * 2(5 + x)

Multiply 0.4 * 2
2.1 = 0.8(5 + x)
2.1 = (5 * 0.8 + x * 0.8)
2.1 = (4 + 0.8x)

Solving
2.1 = 4 + 0.8x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.8x' to each side of the equation.
2.1 + -0.8x = 4 + 0.8x + -0.8x

Combine like terms: 0.8x + -0.8x = 0.0
2.1 + -0.8x = 4 + 0.0
2.1 + -0.8x = 4

Add '-2.1' to each side of the equation.
2.1 + -2.1 + -0.8x = 4 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + -0.8x = 4 + -2.1
-0.8x = 4 + -2.1

Combine like terms: 4 + -2.1 = 1.9
-0.8x = 1.9

Divide each side by '-0.8'.
x = -2.375

Simplifying
x = -2.375