3[5x - 4] - [-30 - 45x] =<span />
<span>Simplifying
3[5x + -4] + -1[-30 + -45x] = 0
</span>
<span>Reorder the terms:
3[-4 + 5x] + -1[-30 + -45x] = 0
[-4 * 3 + 5x * 3] + -1[-30 + -45x] = 0
[-12 + 15x] + -1[-30 + -45x] = 0
-12 + 15x + [-30 * -1 + -45x * -1] = 0
-12 + 15x + [30 + 45x] = 0
</span>
<span>Reorder the terms:
-12 + 30 + 15x + 45x = 0
</span>
<span>Combine like terms: -12 + 30 = 18
18 + 15x + 45x = 0
</span>
<span>Combine like terms: 15x + 45x = 60x
18 + 60x = 0
</span>
<span>Solving
18 + 60x = 0
</span>
<span>Solving for variable 'x'.
</span>
<span>Move all terms containing x to the left, all other terms to the right.
Add '-18' to each side of the equation.
18 + -18 + 60x = 0 + -18
</span>
<span>Combine like terms: 18 + -18 = 0
0 + 60x = 0 + -18
60x = 0 + -18
</span>
<span>
Combine like terms: 0 + -18 = -18
60x = -18
</span>
<span>
Divide each side by '60'.
x = -0.3
</span>
<span>
Simplifying
x = -0.3
</span>