15(x+2.4)+21x=180

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15(x+2.4)+21x=18015(x+2.4)+21x=18015(x+2.4)+21x=18015x+15*2.4+21x=18015x+36+21x=18015x+21x+36=18036x

15(x+2.4)+21x=180
15(x+2.4)+21x=180

15(x+2.4)+21x=180
15x+15*2.4+21x=180
15x+36+21x=180
15x+21x+36=180
36x+36=180
36x=180-36
36x=144
x=144/36
x=4

15x+36+21x=180
36x=144
x=4

15x+2.4x15+21x=180
36x=180-2.4x15
x=4

15(x+2.4)+21x=180
15x+36+21x=180
36x=180-36
36x=144
x=4

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