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x*14.950+(30-x)*16.250=31.2*30
We move all terms to the left:
x*14.950+(30-x)*16.250-(31.2*30)=0
We add all the numbers together, and all the variables
x*14.950+(-1x+30)*16.250-936=0
We multiply parentheses
x*14.950-16.25x+487.5-936=0
Wy multiply elements
14.95x-16.25x+487.5-936=0
We add all the numbers together, and all the variables
-1.3x-448.5=0
We move all terms containing x to the left, all other terms to the right
-1.3x=448.5
x=448.5/-1.3
x=-345
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