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90+2\times 4x=9x
Multiply both sides of the equation by 18, the least common multiple of 9,2.
90+8x=9x
Multiply 2 and 4 to get 8.
90+8x-9x=0
Subtract 9x from both sides.
90-x=0
Combine 8x and -9x to get -x.
-x=-90
Subtract 90 from both sides. Anything subtracted from zero gives its negation.
x=90
Multiply both sides by -1.