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9x-5x+12x+42x-(12x+4x)+123=0
We simplify the equation to the form, which is simple to understand
9x-5x+12x+42x-(12x+4x)+123=0
Simplifying terms in parentheses
9x-5x+12x+42x-(+16x)+123=0
Remove unnecessary parentheses
9x-5x+12x+42x-16x+123=0
We move all terms containing x to the left and all other terms to the right.
+9x-5x+12x+42x-16x=0-123
We simplify left and right side of the equation.
+42x=-123
We divide both sides of the equation by 42 to get x.
x=-2.92857142857
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