3(l-7)+4(8-21)-7=-4(1+2)-6

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Solution for 3(l-7)+4(8-21)-7=-4(1+2)-6 equation:


Simplifying
3(l + -7) + 4(8 + -21) + -7 = -4(1 + 2) + -6

Reorder the terms:
3(-7 + l) + 4(8 + -21) + -7 = -4(1 + 2) + -6
(-7 * 3 + l * 3) + 4(8 + -21) + -7 = -4(1 + 2) + -6
(-21 + 3l) + 4(8 + -21) + -7 = -4(1 + 2) + -6

Combine like terms: 8 + -21 = -13
-21 + 3l + 4(-13) + -7 = -4(1 + 2) + -6

Multiply 4 * -13
-21 + 3l + -52 + -7 = -4(1 + 2) + -6

Reorder the terms:
-21 + -52 + -7 + 3l = -4(1 + 2) + -6

Combine like terms: -21 + -52 = -73
-73 + -7 + 3l = -4(1 + 2) + -6

Combine like terms: -73 + -7 = -80
-80 + 3l = -4(1 + 2) + -6

Combine like terms: 1 + 2 = 3
-80 + 3l = -4(3) + -6

Multiply -4 * 3
-80 + 3l = -12 + -6

Combine like terms: -12 + -6 = -18
-80 + 3l = -18

Solving
-80 + 3l = -18

Solving for variable 'l'.

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

Add '80' to each side of the equation.
-80 + 80 + 3l = -18 + 80

Combine like terms: -80 + 80 = 0
0 + 3l = -18 + 80
3l = -18 + 80

Combine like terms: -18 + 80 = 62
3l = 62

Divide each side by '3'.
l = 20.66666667

Simplifying
l = 20.66666667

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