Answer:
x=6
Explanation:
Using BODMAS Simplify the bracket first
5x+4x-15=9x-15
Cross multiply 9x-15/3 with 1+3×4
9x-15=3(1+3×4)
9x-15=3(1+12)
9x-15=3(13)
9x-15=39
adding 15 to both sides
9x=39+15
9x=54
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