3(2.1b-1.2)=4(0.7b+0.85)

Solution for 3(2.1b-1.2)=4(0.7b+0.85) equation:

Simplifying
3(2.1b + -1.2) = 4(0.7b + 0.85)

Reorder the terms:
3(-1.2 + 2.1b) = 4(0.7b + 0.85)
(-1.2 * 3 + 2.1b * 3) = 4(0.7b + 0.85)
(-3.6 + 6.3b) = 4(0.7b + 0.85)

Reorder the terms:
-3.6 + 6.3b = 4(0.85 + 0.7b)
-3.6 + 6.3b = (0.85 * 4 + 0.7b * 4)
-3.6 + 6.3b = (3.4 + 2.8b)

Solving
-3.6 + 6.3b = 3.4 + 2.8b

Solving for variable 'b'.

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

Add '-2.8b' to each side of the equation.
-3.6 + 6.3b + -2.8b = 3.4 + 2.8b + -2.8b

Combine like terms: 6.3b + -2.8b = 3.5b
-3.6 + 3.5b = 3.4 + 2.8b + -2.8b

Combine like terms: 2.8b + -2.8b = 0.0
-3.6 + 3.5b = 3.4 + 0.0
-3.6 + 3.5b = 3.4

Add '3.6' to each side of the equation.
-3.6 + 3.6 + 3.5b = 3.4 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + 3.5b = 3.4 + 3.6
3.5b = 3.4 + 3.6

Combine like terms: 3.4 + 3.6 = 7
3.5b = 7

Divide each side by '3.5'.
b = 2

Simplifying
b = 2