Question

me ajuda!!!!!! preciso urgente do cálculo

Answer 1

1) 2x+5+4x+10+3x+12=90

9x+27=90

9x=90-27

9x=63

x=63/9

x=7

2) x+2+6x+10+2x+15=180

9x+27=180

9x=180-27

9x=153

x=153/9

x=17

3) 7x+15+2x+5+6x+10=90

15x+30=90

15x=60

x=4

4) 4x+11+8x+15+6x+10=180

18x+36=180

18x=144

x=8